Answers 26-27 IC Physics 7614BWave Properties

Electrostatics Answers

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Tracy scuffs her socked feet across a carpet. When she touches a doorknob, she gets a small shock.How did Tracy become charged?

through friction between her hand and the doorknob

through friction between her feet and the carpet

through conduction between her hand and the doorknob

through conduction between her feet and the carpet

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How does charging by conduction occur?

A charged object is brought near a neutral object without touching it.

A neutral object touches another neutral object.

A charged object touches a neutral object.

A neutral object is brought near another neutral object without touching it.

A positive rod is placed to the left of sphere A, and the spheres are separated.

Sphere A is negative and sphere B is positive because protons from sphere A are attracted to the rod and move to sphere B.

Sphere A is negative and sphere B is positive because electrons from sphere B are attracted to the rod and move to sphere A.

Sphere A is positive and sphere B is negative because electrons from the rod move to sphere B and protons then move to sphere A.

Sphere A is positive and sphere B is negative because protons move from sphere B to the rod and also to sphere A.

What is the value of the charge that experiences a force of 2.4 × 10–3 N in an electric field of 6.8 × 10–5 N/C?

1.6 × 10–7 C

2.5 × 10–3 C

2.8 × 10–3 C

3.5 × 101 C

The area around a charged object that can exert a force on other charged objects is a(n) _________.

electric field

field line

conductor

electric potential energy

What is the electric potential energy of a charge that experiences a force of 3.6 × 10–4 N when it is 9.8 × 10–5 m from the source of the electric field?

3.5 × 10–8 J

4.6 × 10–4 J

2.7 × 10–1 J

3.7 × 100 J

Marta, Cato, and Juan plan a skit to illustrate one of the methods of charging.Marta and Cato are walking together. Each has one flower and one box of candy. Juan offers Cato a huge bouquet of flowers, but Cato can’t take it because his hands are full.Cato hands his flower to Marta and then turns to Juan to take the bouquet.Marta walks away in one direction with two flowers and one box of candy. Juan keeps the bouquet and walks away in the other direction. Cato looks sad standing alone with only a box of candy.

It models induction because an electron (a flower) transfers from Cato to Marta through direct contact.

It models friction because an electron (a flower) transfers from Cato to Marta through direct contact.

It models friction because the offer of flowers represents a charged object that causes an electron (a flower) to transfer from one object to another.

It models induction because the offer of flowers represents a charged object that causes an electron (a flower) to transfer from one object to another.

A charge of 8.5 × 10–6 C is in an electric field that has a strength of 3.2 × 105 N/C. What is the electric force acting on the charge?

0.27 N

2.7 N

27 N

270 N

How do the charges compare when two objects are charged through friction?

The objects become oppositely charged and have equal amounts of charge.

The objects become positively charged and have equal amounts of charge.

The objects become negatively charged and have different amounts of charge.

The objects become oppositely charged and have different amounts of charge.

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