Answers 26-27 IC Physics 7614BWave Properties

Wave Properties — Unit test Answers

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Lidia makes a graphic organizer of the methods of charging.

Charged object must touch

Charged object must not touch

Electrons move

Protons move

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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.

Charges of +3 µC and –5 µC are 2 mm from each other. The –5 µC charge is replaced with a +5 µC charge.

same force, but in the opposite direction

same force, but in the same direction

greater force, but in the opposite direction

greater force, but in the same direction

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

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.

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.

The diagram shows the electric field around two charged objects.

W: PositiveX: Positive

W: NegativeX: Negative

W: NegativeX: Positive

W: PositiveX: Negative

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

How does charging by conduction compare with charging by induction?

A charged object is needed in conduction but not in induction.

Two neutral objects are needed in conduction but not in induction.

Objects must touch in induction but not in conduction.

Oppositely charged objects form in induction but not in conduction.

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.

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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Wave Properties — Unit test Answers

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