Electromagnetism quiz CP

Last updated almost 2 years ago

10 questions

1

Which statement best explains how iron can become a magnet?

Electrons are easily removed,

Electrons spin in a unique direction.

Atoms have smaller nuclei.

Atoms are strongly bonded together.

Two parallel copper wires are each carrying the same electrical current in the same direction. Which statement explains how they respond to each other?

They strengthen each other, because they have opposite magnetic fields.

They strengthen each other, because they have similar magnetic fields.

They repel each other, because they have similar magnetic fields.

They repel each other, because they have opposite magnetic fields.

The diagram below shows an object made from a battery, a nail, and some wire.

What will happen if you touch a metal paperclip to the nail?

The paperclip will stick to the nail.

The wires will melt.

The battery will spark.

The nail will give you a shock.

Which of the following electromagnets would have the greatest magnetic field?

The diagram below shows a bar magnet within a coil of conducting wire. The magnet is moved back and forth. The magnet never has contact with the wire.

As the magnet is moved, the wire will

decrease in temperature.

have an electric current.

demagnetize the bar magnet.

become negatively charged.

The diagram below shows current flow through a wire.
Which of the following represents the magnetic field resulting from the current?

The diagram pictured shows a loop of wire being rotated at a constant rate about an axis in a uniform magnetic field.

As the speed of rotation of the wire loop is increased, the maximum voltage induced in the loop

decreases

increases

remains the same

What is the main advantage of using alternating current (AC) over direct current (DC) when transmitting electricity?

AC power lines need less insulation than DC power lines.

AC has fewer power surge problems than DC

AC makes it easier to step voltage up or down with transformers, as compared to DC.

AC is not affected by the use of transformers, but the use of DC requires transformers.

The primary coil of a transformer has 400 turns; the secondary coil has 1,000 turns. An alternating current is sent through the primary coil. The voltage in the primary coil has an amplitude of 17 V. Which statement best describes the voltage amplitude in the secondary coil?

between 0 V and 17 V, because transformer coils are insulators

between 17 V and 50 V, because the coils form a step-up transformer

between 0 V and 17 V, because the coils form a step-down transformer

between 17 V and 50 V, because transformer coils are conductors

The diagram shows a wire loop rotating between magnetic poles. During 360 degrees of rotation from the position shown, the induced voltage changes in

both magnitude and direction

neither magnitude nor direction

magnitude, only

Which statement best explains how iron can become a magnet?

Electrons are easily removed,

Electrons spin in a unique direction.

Atoms have smaller nuclei.

Atoms are strongly bonded together.

Two parallel copper wires are each carrying the same electrical current in the same direction. Which statement explains how they respond to each other?

They strengthen each other, because they have opposite magnetic fields.

They strengthen each other, because they have similar magnetic fields.

They repel each other, because they have similar magnetic fields.

They repel each other, because they have opposite magnetic fields.

The diagram below shows an object made from a battery, a nail, and some wire.

What will happen if you touch a metal paperclip to the nail?

The paperclip will stick to the nail.

The wires will melt.

The battery will spark.

The nail will give you a shock.

Which of the following electromagnets would have the greatest magnetic field?

The diagram below shows a bar magnet within a coil of conducting wire. The magnet is moved back and forth. The magnet never has contact with the wire.

As the magnet is moved, the wire will

decrease in temperature.

have an electric current.

demagnetize the bar magnet.

become negatively charged.

The diagram below shows current flow through a wire.
Which of the following represents the magnetic field resulting from the current?

The diagram pictured shows a loop of wire being rotated at a constant rate about an axis in a uniform magnetic field.

As the speed of rotation of the wire loop is increased, the maximum voltage induced in the loop

decreases

increases

remains the same

What is the main advantage of using alternating current (AC) over direct current (DC) when transmitting electricity?

AC power lines need less insulation than DC power lines.

AC has fewer power surge problems than DC

AC makes it easier to step voltage up or down with transformers, as compared to DC.

AC is not affected by the use of transformers, but the use of DC requires transformers.

The primary coil of a transformer has 400 turns; the secondary coil has 1,000 turns. An alternating current is sent through the primary coil. The voltage in the primary coil has an amplitude of 17 V. Which statement best describes the voltage amplitude in the secondary coil?

between 0 V and 17 V, because transformer coils are insulators

between 17 V and 50 V, because the coils form a step-up transformer

between 0 V and 17 V, because the coils form a step-down transformer

between 17 V and 50 V, because transformer coils are conductors

The diagram shows a wire loop rotating between magnetic poles. During 360 degrees of rotation from the position shown, the induced voltage changes in

both magnitude and direction

neither magnitude nor direction

magnitude, only

Electromagnetism quiz CP

Electromagnetism quiz CP

Which statement best explains how iron can become a magnet?

Two parallel copper wires are each carrying the same electrical current in the same direction. Which statement explains how they respond to each other?

The diagram below shows an object made from a battery, a nail, and some wire.What will happen if you touch a metal paperclip to the nail?

Which of the following electromagnets would have the greatest magnetic fi eld?

The diagram below shows a bar magnet within a coil of conducting wire. The magnet is moved back and forth. The magnet never has contact with the wire.As the magnet is moved, the wire will

The diagram below shows current flow through a wire.Which of the following represents the magnetic field resulting from the current?

The diagram pictured shows a loop of wire being rotated at a constant rate about an axis in a uniform magnetic fi eld.As the speed of rotation of the wire loop is increased, the maximum voltage induced in the loop

What is the main advantage of using alternating current (AC) over direct current (DC) when transmitting electricity?

The primary coil of a transformer has 400 turns; the secondary coil has 1,000 turns. An alternating current is sent through the primary coil. The voltage in the primary coil has an amplitude of 17 V. Which statement best describes the voltage amplitude in the secondary coil?

The diagram shows a wire loop rotating between magnetic poles. During 360 degrees of rotation from the position shown, the induced voltage changes in

The diagram below shows an object made from a battery, a nail, and some wire.

What will happen if you touch a metal paperclip to the nail?

Which of the following electromagnets would have the greatest magnetic field?

The diagram below shows a bar magnet within a coil of conducting wire. The magnet is moved back and forth. The magnet never has contact with the wire.

As the magnet is moved, the wire will

The diagram below shows current flow through a wire.
Which of the following represents the magnetic field resulting from the current?

The diagram pictured shows a loop of wire being rotated at a constant rate about an axis in a uniform magnetic field.

As the speed of rotation of the wire loop is increased, the maximum voltage induced in the loop