Electromagnetism Formative Assessment

Last updated almost 4 years ago

26 questions

Note from the author:

Formative test on principles of electromagnetism, including Lorentz force, Faraday's law, Lenz's Law, DC motors, AC generators and transformers.

Required

Electromagnetism Formative Assessment

Electromagnetism Formative Assessment

The output of a device is shown.

Which diagram(s) represent the device that has the output shown? Note: More than one answer may be correct.

A conductor PQ is in a uniform magnetic field. The conductor rotates around the end P at a constant angular velocity.

Which graph shows the induced emf between P and Q as the conductor completes one revolution from the position shown?

A positively charged particle is moving at velocity, v, in an electric field as shown

What is the direction of the force acting on the particle due to the electric field?

Which graph shows the magnitude of back emf induced in a DC motor rotating continuously as the rotational frequency increases.

Two long, parallel conductors X and Y are connected to a light bulb and an AC power supply. The conductors are suspended horizontally from fixed points using sensitive spring balances. X is positioned directly below Y.

A DC motor is rotated with a period of 0.2 s. On the axes below, sketch how the induced emf varies against time. Note: only the time axis requires a scale. You should assume that it starts rotation at the position shown.

Watch the video below. Describe your observations and explain them with reference to appropriate Physics concepts.

A DC motor is constructed from a single loop of wire with dimensions 0.10 m × 0.07 m. The magnetic field strength is 0.40 T and a current of 14 A flows through the loop.

A bar magnet is moved away from a stationary coil. Which diagram correctly shows the direction of the induced current in the coil and the resulting magnetic polarity of the coil?

A circular loop of wire is connected to a battery and a lamp. The apparatus is moved from P to Q along the path shown at a constant velocity through a region containing a uniform magnetic field.

Which graph shows the brightness of the lamp as the apparatus moves between P and Q?

The diagram shows a current-carrying conductor in a magnetic field.'

The diagram shows some parts of a simple DC motor.

Which row of the table correctly describes the direction of force acting on side WX and the direction of torque this produces on the coil?

A magnet rests on an electronic balance. A rigid copper rod runs horizontally through the magnet, at right angles to the magnetic field. The rod is anchored so that it cannot move.

Which expression can be used to calculate the balance reading when the switch is closed?

A magnet approaches a coil with six turns, as shown in the diagram below. During time interval ∆t, the magnetic flux changes by 0.05 Wb and the average induced EMF is 1.2 V.

Which one of the following is closest to the time interval ∆t?

Transformers are equally capable of changing the voltage of a.c. and d.c. sources

A student builds a model electric generator, similar to that shown in the diagram below.
The coil consists of 50 turns of wire and has an area of 6.0 x 10 - 3 m2. The magnetic field between the poles of the magnets is measured to be 0.15 T.

What is the flux linkage in the loop?

An ideal transformer is designed to give a 6.0 V output from a 240 V input. The primary coil consists of 1000 turns. Which row of the following table is correct?

The output of a device is shown.

Which diagram(s) represent the device that has the output shown? Note: More than one answer may be correct.

A conductor PQ is in a uniform magnetic field. The conductor rotates around the end P at a constant angular velocity.

Which graph shows the induced emf between P and Q as the conductor completes one revolution from the position shown?

A positively charged particle is moving at velocity, v, in an electric field as shown

What is the direction of the force acting on the particle due to the electric field?

Which graph shows the magnitude of back emf induced in a DC motor rotating continuously as the rotational frequency increases.

Two long, parallel conductors X and Y are connected to a light bulb and an AC power supply. The conductors are suspended horizontally from fixed points using sensitive spring balances. X is positioned directly below Y.

A DC motor is rotated with a period of 0.2 s. On the axes below, sketch how the induced emf varies against time. Note: only the time axis requires a scale. You should assume that it starts rotation at the position shown.

Watch the video below. Describe your observations and explain them with reference to appropriate Physics concepts.

A DC motor is constructed from a single loop of wire with dimensions 0.10 m × 0.07 m. The magnetic field strength is 0.40 T and a current of 14 A flows through the loop.

A bar magnet is moved away from a stationary coil. Which diagram correctly shows the direction of the induced current in the coil and the resulting magnetic polarity of the coil?

A circular loop of wire is connected to a battery and a lamp. The apparatus is moved from P to Q along the path shown at a constant velocity through a region containing a uniform magnetic field.

Which graph shows the brightness of the lamp as the apparatus moves between P and Q?

The diagram shows a current-carrying conductor in a magnetic field.'

The diagram shows some parts of a simple DC motor.

Which row of the table correctly describes the direction of force acting on side WX and the direction of torque this produces on the coil?

A magnet rests on an electronic balance. A rigid copper rod runs horizontally through the magnet, at right angles to the magnetic field. The rod is anchored so that it cannot move.

Which expression can be used to calculate the balance reading when the switch is closed?

A magnet approaches a coil with six turns, as shown in the diagram below. During time interval ∆t, the magnetic flux changes by 0.05 Wb and the average induced EMF is 1.2 V.

Which one of the following is closest to the time interval ∆t?

Transformers are equally capable of changing the voltage of a.c. and d.c. sources

A student builds a model electric generator, similar to that shown in the diagram below.
The coil consists of 50 turns of wire and has an area of 6.0 x 10 - 3 m2. The magnetic field between the poles of the magnets is measured to be 0.15 T.

What is the flux linkage in the loop?

An ideal transformer is designed to give a 6.0 V output from a 240 V input. The primary coil consists of 1000 turns. Which row of the following table is correct?

Electromagnetism Formative Assessment

Electromagnetism Formative Assessment

The output of a device is shown.Which diagram(s) represent the device that has the output shown? Note: More than one answer may be correct.

A conductor PQ is in a uniform magnetic field. The conductor rotates around the end P at a constant angular velocity.Which graph shows the induced emf between P and Q as the conductor completes one revolution from the position shown?

A positively charged particle is moving at velocity, v, in an electric field as shownWhat is the direction of the force acting on the particle due to the electric field?

Which graph shows the magnitude of back emf induced in a DC motor rotating continuously as the rotational frequency increases.

Two long, parallel conductors X and Y are connected to a light bulb and an AC power supply. The conductors are suspended horizontally from fixed points using sensitive spring balances. X is positioned directly below Y.

A DC motor is rotated with a period of 0.2 s. On the axes below, sketch how the induced emf varies against time. Note: only the time axis requires a scale. You should assume that it starts rotation at the position shown.

Watch the video below. Describe your observations and explain them with reference to appropriate Physics concepts.

A DC motor is constructed from a single loop of wire with dimensions 0.10 m × 0.07 m. The magnetic field strength is 0.40 T and a current of 14 A flows through the loop.

A bar magnet is moved away from a stationary coil. Which diagram correctly shows the direction of the induced current in the coil and the resulting magnetic polarity of the coil?

A circular loop of wire is connected to a battery and a lamp. The apparatus is moved from P to Q along the path shown at a constant velocity through a region containing a uniform magnetic field.Which graph shows the brightness of the lamp as the apparatus moves between P and Q?

The diagram shows a current-carrying conductor in a magnetic field.'

The diagram shows some parts of a simple DC motor.Which row of the table correctly describes the direction of force acting on side WX and the direction of torque this produces on the coil?

A magnet rests on an electronic balance. A rigid copper rod runs horizontally through the magnet, at right angles to the magnetic field. The rod is anchored so that it cannot move.Which expression can be used to calculate the balance reading when the switch is closed?

A magnet approaches a coil with six turns, as shown in the diagram below. During time interval ∆t, the magnetic flux changes by 0.05 Wb and the average induced EMF is 1.2 V.Which one of the following is closest to the time interval ∆t?

Transformers are equally capable of changing the voltage of a.c. and d.c. sources

A student builds a model electric generator, similar to that shown in the diagram below.The coil consists of 50 turns of wire and has an area of 6.0 x 10 - 3 m2. The magnetic field between the poles of the magnets is measured to be 0.15 T.What is the flux linkage in the loop?

An ideal transformer is designed to give a 6.0 V output from a 240 V input. The primary coil consists of 1000 turns. Which row of the following table is correct?

The output of a device is shown.Which diagram(s) represent the device that has the output shown? Note: More than one answer may be correct.

A conductor PQ is in a uniform magnetic field. The conductor rotates around the end P at a constant angular velocity.Which graph shows the induced emf between P and Q as the conductor completes one revolution from the position shown?

A positively charged particle is moving at velocity, v, in an electric field as shownWhat is the direction of the force acting on the particle due to the electric field?

Which graph shows the magnitude of back emf induced in a DC motor rotating continuously as the rotational frequency increases.

Two long, parallel conductors X and Y are connected to a light bulb and an AC power supply. The conductors are suspended horizontally from fixed points using sensitive spring balances. X is positioned directly below Y.

A DC motor is rotated with a period of 0.2 s. On the axes below, sketch how the induced emf varies against time. Note: only the time axis requires a scale. You should assume that it starts rotation at the position shown.

Watch the video below. Describe your observations and explain them with reference to appropriate Physics concepts.

A DC motor is constructed from a single loop of wire with dimensions 0.10 m × 0.07 m. The magnetic field strength is 0.40 T and a current of 14 A flows through the loop.

A bar magnet is moved away from a stationary coil. Which diagram correctly shows the direction of the induced current in the coil and the resulting magnetic polarity of the coil?

A circular loop of wire is connected to a battery and a lamp. The apparatus is moved from P to Q along the path shown at a constant velocity through a region containing a uniform magnetic field.Which graph shows the brightness of the lamp as the apparatus moves between P and Q?

The diagram shows a current-carrying conductor in a magnetic field.'

The diagram shows some parts of a simple DC motor.Which row of the table correctly describes the direction of force acting on side WX and the direction of torque this produces on the coil?

A magnet rests on an electronic balance. A rigid copper rod runs horizontally through the magnet, at right angles to the magnetic field. The rod is anchored so that it cannot move.Which expression can be used to calculate the balance reading when the switch is closed?

A magnet approaches a coil with six turns, as shown in the diagram below. During time interval ∆t, the magnetic flux changes by 0.05 Wb and the average induced EMF is 1.2 V.Which one of the following is closest to the time interval ∆t?

Transformers are equally capable of changing the voltage of a.c. and d.c. sources

A student builds a model electric generator, similar to that shown in the diagram below.The coil consists of 50 turns of wire and has an area of 6.0 x 10 - 3 m2. The magnetic field between the poles of the magnets is measured to be 0.15 T.What is the flux linkage in the loop?

An ideal transformer is designed to give a 6.0 V output from a 240 V input. The primary coil consists of 1000 turns. Which row of the following table is correct?

The output of a device is shown.

Which diagram(s) represent the device that has the output shown? Note: More than one answer may be correct.

A conductor PQ is in a uniform magnetic field. The conductor rotates around the end P at a constant angular velocity.

Which graph shows the induced emf between P and Q as the conductor completes one revolution from the position shown?

A positively charged particle is moving at velocity, v, in an electric field as shown

What is the direction of the force acting on the particle due to the electric field?

A circular loop of wire is connected to a battery and a lamp. The apparatus is moved from P to Q along the path shown at a constant velocity through a region containing a uniform magnetic field.

Which graph shows the brightness of the lamp as the apparatus moves between P and Q?

The diagram shows some parts of a simple DC motor.

Which row of the table correctly describes the direction of force acting on side WX and the direction of torque this produces on the coil?

A magnet rests on an electronic balance. A rigid copper rod runs horizontally through the magnet, at right angles to the magnetic field. The rod is anchored so that it cannot move.

Which expression can be used to calculate the balance reading when the switch is closed?

A magnet approaches a coil with six turns, as shown in the diagram below. During time interval ∆t, the magnetic flux changes by 0.05 Wb and the average induced EMF is 1.2 V.

Which one of the following is closest to the time interval ∆t?

A student builds a model electric generator, similar to that shown in the diagram below.
The coil consists of 50 turns of wire and has an area of 6.0 x 10 - 3 m2. The magnetic field between the poles of the magnets is measured to be 0.15 T.

What is the flux linkage in the loop?

The output of a device is shown.

Which diagram(s) represent the device that has the output shown? Note: More than one answer may be correct.

A conductor PQ is in a uniform magnetic field. The conductor rotates around the end P at a constant angular velocity.

Which graph shows the induced emf between P and Q as the conductor completes one revolution from the position shown?

A positively charged particle is moving at velocity, v, in an electric field as shown

What is the direction of the force acting on the particle due to the electric field?

A circular loop of wire is connected to a battery and a lamp. The apparatus is moved from P to Q along the path shown at a constant velocity through a region containing a uniform magnetic field.

Which graph shows the brightness of the lamp as the apparatus moves between P and Q?

The diagram shows some parts of a simple DC motor.

Which row of the table correctly describes the direction of force acting on side WX and the direction of torque this produces on the coil?

A magnet rests on an electronic balance. A rigid copper rod runs horizontally through the magnet, at right angles to the magnetic field. The rod is anchored so that it cannot move.

Which expression can be used to calculate the balance reading when the switch is closed?

A magnet approaches a coil with six turns, as shown in the diagram below. During time interval ∆t, the magnetic flux changes by 0.05 Wb and the average induced EMF is 1.2 V.

Which one of the following is closest to the time interval ∆t?

A student builds a model electric generator, similar to that shown in the diagram below.
The coil consists of 50 turns of wire and has an area of 6.0 x 10 - 3 m2. The magnetic field between the poles of the magnets is measured to be 0.15 T.

What is the flux linkage in the loop?