Answers DSD-CR-Physics-Term 4Electrostatics

Electrostatics Answers

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Which pair does NOT have an electric force between them?

a positive object and negative object

two positive objects

two neutral objects

two negative objects

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Which best describes the materials that make up an electrical cord?

a metallic conductor lacking free electrons surrounded by a rubber insulator with free electrons

a metallic conductor with free electrons surrounded by a rubber insulator lacking free electrons

a metallic insulator with free electrons surrounded by a rubber conductor lacking free electrons

a metallic insulator lacking free electrons surrounded by a rubber conductor with free electrons

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

How does a rubber rod become negatively charged through friction?

It touches a negatively charged object, and protons move off of the rod.

It touches a positively charged object, and electrons move onto the rod.

It is rubbed with another object, and electrons move onto the rod.

It is rubbed with another object, and protons move off of the rod.

Through which element would someone most likely receive a shock?

iodine (I)

sulfur (S)

phosphorus (P)

chromium (Cr)

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.

Jason makes a graphic organizer for insulators and conductors and wants to add the following labels to it.Label 1: Lacks free electronsLabel 2: AluminumIn which regions should Jason place each label?

Label 1: XLabel 2: Y

Label 1: ZLabel 2: X

Label 1: XLabel 2: Z

Label 1: ZLabel 2: Z

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.

A charge of 6.4 × 10–7 C experiences an electric force of 1.8 × 10–1 N. What is the electric field strength?

1.1 × 10–7 N/C

3.6 × 10–6 N/C

8.2 × 100 N/C

2.8 × 105 N/C

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