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S4w5 Practice for Test

Last updated 3 months ago
27 questions
1

Two charged objects have a repulsive force of 0.080N. If the charge of one of those is doubled, what is the new force?

1

Two charged objects have a repulsive force of 0.080N. If the distance between them is cut in half, what is the new force?

1

An object with a charge of -5.33x10-6 C exerts an attractive force of 5.36 N on a second object location 0.408 m away. Calculate the magnitude of charge on the second object.

1

a magnetic field is induced by

1

Categorize the circuits - what is the current state of the circuit with the switch S open?

  • (1)
  • (2)
  • (3)
  • (4)
  • R1 would be on, but R2 would not
  • R2 would be on, but R1 would not
  • Neither R1 or R2 are on
  • Both R1 and R2 are on
1

1

A 15-ohm resistor, R1 , and a 30-ohm resistor, R2 , are to be connected in parallel between points A and B in a circuit containing a 90-volt battery. Draw the two resistors.

1

What is the potential difference across resistor R1 in the circuit above?

1

Calculate the current across R1

1

In which circuit would ammeter A show the greatest current?

1

In the circuit diagram below, two 4-ohm resistors are connected to a 16-volt battery as shown. what is the equivalent resistance in the circuit?

1

What is the current across the top resistor?

1

How much power is the circuit using?

1

Two identical resistors connected in series have an equivalent resistance of 4 ohms. The same two resistors, when connected in parallel, have an equivalent resistance of

1

A 6-ohm lamp requires 0.25 ampere of current to operate. In which circuit below would the lamp operate correctly when switch S is closed?

1

Two identical resistors connected in parallel have an equivalent resistance of 40 ohms. What is the resistance of each resistor?

1

The diagram below represents a simple circuit consisting of a variable resistor (simply a resistor with a knob that you can use to increase or decrease the resistance of the resistor), a battery, an ammeter, and a voltmeter.


What is the effect of increasing the resistance of the variable resistor from 1000 Ω to 10000 Ω? [Assume constant temperature.]

1

Why do you think the question above asks you to assume constant temperature? thinking through what you already know, how might not assuming constant temperature tell you something?

Required
1

An electron travelling in a straight line with an initial velocity, u, enters a region between two charged plates in which there is an electric field causing it to travel along the path as shown.

A magnetic field is then applied causing a second electron with the same initial velocity to pass through undeflected. Which row of the table shows the directions of the electric and magnetic fields when the second electron enters the region between the plates?


1

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?

1

The diagram shows a DC circuit containing a transformer.

The potential differences V1 and V2 are measured continuously for 4 s. The switch is initially closed. At t = 2 s, the switch is opened. Which pair of graphs shows how the potential differences V1 and V2 vary with time over the 4-second interval?

Required
1

A meter should indicate ______ volts when connected across a 100 Ω resistor that has 6 amps of current passing through it.

Required
1

______ amperes will be present when a 30 ohm resistor is connected to a 6 volt source.

1

For step up and step down transformers, which of the following is true, as the current in one coil induces current in another coil.

1

match the equation to the use

Draggable itemCorresponding Item
inverse square law
strength of an electric field
V=IR
find the power expended by a resistor
P=VI
Find the equivalent resistance of two resistors in series
to determine the change in voltage across a transformer
force on a between two particles
Find the equivalent resistance of two resistors in parallel
to determine the current given a a voltage source and a resistor
1

While out for a walk with his mother, Lance notices a large, cylindrical gray box high atop a telephone pole. His mother explains that it is a transformer. This transformer takes 6000 V from the power company and steps it down to the 240 V supplied to each of the houses on the street, with the use of a secondary coil containing 100 turns. How many turns are there in the primary coil?

1

Audrey disassembles the control box of her electric train and finds a small transformer inside. Its primary coil is made up of 600 turns and the secondary coil is made up of 60 turns. If the household voltage supplied to the train is 120 V, what voltage is required to make the train run?