Answers BHS-Physics B-CRUnit Test

Unit Test — Unit test Answers

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How do electric field lines indicate the strength of the field?

by how long the lines are

by how close the lines are

by the direction the lines are pointing

by showing the charge that creates the lines

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The diagram shows the electric field around two charged objects.

W: PositiveX: Positive

W: NegativeX: Negative

W: NegativeX: Positive

W: PositiveX: Negative

Which principle states that the net electrical force on a specific charge is equal to the sum of the vector components of the charges applying forces on it?

angle principle

summation principle

superposition principle

vector principle

Lionel makes a graphic organizer to compare the electric field around a positive charge with the electric field around a negative charge.

X: Points away from the chargeY: Points in the direction of the force on the positive chargeZ: Points toward the charge

X: Points away from the chargeY: Points in the direction of the force on the negative chargeZ: Points toward the charge

X: Points toward the chargeY: Points in the direction of the force on the positive chargeZ: Points away from the charge

X: Points toward the chargeY: Points in the direction of the force on the negative chargeZ: Points away from the charge

A source charge of 3 µC generates an electric field of 2.86 × 105 N/C at the location of a test charge.What is the distance, to the nearest hundredth, of the test charge from the source charge? m

Answer not available

For a constant resistance, how is the voltage related to the current?

Voltage is inversely proportional to current, so when the voltage doubles, the current is cut in half.

Voltage is directly proportional to current, so when the voltage doubles, the current is cut in half.

Voltage is inversely proportional to current, so when the voltage doubles, the current doubles.

Voltage is directly proportional to current, so when the voltage doubles, the current doubles.

A point charge is used to determine the electric field around a charged particle. Why is it necessary that the point charge does not affect the position of the charge being tested?

The amount of charge will increase if the charged particle moves closer to the point charge, so any change in position changes the field.

The amount of charge will decrease if the charged particle moves closer to the point charge, so any change in position changes the field.

Electric fields are inversely proportional to the square of the distance, so any change in position changes the field.

Electric fields are directly proportional to distance, so any change in position changes the field.

The table lists the time it takes for an amount of charge to pass through a point in a wire. Janelle is exploring the relationship between the brightness of a light bulb and the current that powers it. When applying these currents to the same bulb, the bulb is brighter when the current is greater.Which lists the currents in the order of the bulb brightness they cause from most bright to least bright?

W, Y, X, Z

Y, W, Z, X

W, Y, Z, X

X, Z, W, Y

What is the current in a circuit with a 9.0 V battery and a resistance of 36.0 Ω?

0.25 A

4.0 A

45 A

324 A

These two images show pairs of oppositely charged plates that create uniform electric fields. The strength of the field on the right is twice as strong as that of the field on the left. In the field on the left, a positive charge changes position as shown. In the field on the right, a negative charge that has twice the magnitude of the positive charge is placed midway between the plates.

It can be moved 0.04 m toward the positive plate.

It can be moved 0.04 m toward the negative plate.

It can be moved 0.01 m toward the positive plate.

It can be moved 0.01 m toward the negative plate.

A neon light consists of a glass tube with metal wires at each end. When connected to a high-voltage source, the gas glows.If a fly lands on the glass tube, what will most likely happen?

The fly will not feel a shock because the glass conducts any free electrons back into the gas.

Electrons will flow directly from the metal wires along the glass and shock the fly.

The fly will not feel a shock because the glass insulates it from the electrons in the gas and the metal.

Electrons that are moving through the gas will be conducted through the glass and shock the fly.

The table lists the values of the constants used to calculate the electrical force and the gravitational force.

The electrical force is much smaller than the gravitational force because 8.99 is much greater than 6.67.

The electrical force is much larger than the gravitational force because 8.99 is much greater than 6.67.

The electrical force is much smaller than the gravitational force because 109 is much greater than 10–11.

The electrical force is much larger than the gravitational force because 109 is much greater than 10–11.

Current X is 2.5 A and runs for 39 seconds. Current Y is 3.8 A and runs for 24 seconds.Which current delivered more charge, and how much more charge did it deliver?

X delivered 97.5 C more than Y.

X delivered 6.3 C more than Y.

Y delivered 91.2 C more than X.

Y delivered 1.3 C more than X.

A charge of 40 µC is pushed by a force of 15 µN a distance of 1.3 mm in an electric field.

2.0 × 10-8 V

4.6 × 10-7 V

4.9 × 10-4 V

3.8 × 10-1 V

If the distance between two charges is increased to three times the original distance, how will the electrical force between the charges compare with the original force?

It will increase to three times the original force.

It will increase to nine times the original force.

It will decrease to one-third the original force.

It will decrease to one-ninth the original force.

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