Quiz about Coulomb's Law and Electric Fields

Question 1

Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.

Accepted Answer

-, +

Answer

+, +

Answer

+, -

Answer

-, -

Question 2

Coulomb's law also says if distance increases, then force

Accepted Answer

decreases

Answer

disapears

Answer

destroyed in a heartbeat

Answer

doubles

Question 3

If one of the charges doubles, what happens to the force?

Accepted Answer

it doubles

Answer

it gets cut in half

Answer

it quadruples

Answer

it is cut by 1/4

Question 4

The electric field lines for a positive charge is always directed away from the charge. True or False?

Accepted Answer

True

Answer

False

Question 5

Which of the following statements is false about electric field lines

Accepted Answer

electric field lines are always straight lines

Answer

electric field lines cannot cross

Answer

electric field lines point away from positive charge

Answer

electric field lines show how a proton would move in an electric field

Question 6

Where can an electric field be found?

Accepted Answer

in the space surrounding a charged object

Answer

below a force field

Answer

in a gravitational field

Answer

outside of a magnetic field

Question 7

The variable "r" in Coulomb's Law would have what units?

Accepted Answer

Meters

Answer

Joules

Answer

Coulombs

Answer

Newtons

Question 8

What happens to the force between two charged objects if you reduce the distance between two objects from 30 cm to 10 cm?

Accepted Answer

1/3X

Answer

3X

Answer

20X

Answer

9X

Question 9

What is the value of Coulomb's Electrostatic Constant?

Accepted Answer

8.99 x 10⁹ Nm²C^-2

Answer

8.987 Nm²C^-2

Answer

8.987 x 10¹¹ Nm²C^-2

Answer

7.1 x 10^4.5 Nm²C^-2

Question 10

A point charge (q1) has a magnitude of 3x10^-6C. A second charge (q2) has a magnitude of -1.5x10^-6 C and is located 0.12 m from the first charge. Determine the electrostatic force each charge exerts on the other.

Accepted Answer

-2.81 N

Answer

-4.52 x 10^-3 N

Answer

-83 N

Answer

-9 x 10³ N

Question 11

The magnitude of the electric force between two charged objects is given by an equation known as:

Accepted Answer

Coulomb's Law.

Answer

Ohm's Law.

Answer

Newton's Third Law.

Answer

Murphy's Law.

Question 12

An electrostatic force of 2 X 10²N is exerted on a charge of 4 Coulomb at point P in an electric field. What is the magnitude of the electric field intensity at P?

Accepted Answer

50 N/C

Answer

8 X 10² N/C

Answer

5 N/C

Answer

2 X 10^-2 N/C

Question 13

When an object gains electrons it becomes __________

Accepted Answer

Negatively charged

Answer

Neutral

Answer

Positively charged

Question 14

What is the unit for electrostatic charge?

Accepted Answer

Coulombs

Answer

Newtons

Answer

Meters

Answer

Joules

Question 15

What will be the units of F (or F_e)?

Accepted Answer

Newtons

Answer

Meters

Answer

Coulombs

Answer

Joules

Question 16

Which quantity and unit are correctly paired?

Accepted Answer

electric field strength and N/C

Answer

electricity and Coulombs

Answer

electrostatic force and electrons

Answer

electric field strength and E

Question 17

At which point is the electric field the strongest

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 18

At which point is the electric field the weakest?

Accepted Answer

because the field lines are further apart

Answer

because it is the furthest away

Answer

because it is the furthest away

Question 19

Consider the electric field lines drawn at the right for a configuration of two charges. Several locations are labeled on the diagram. Which of these shows the ranking in order of weakest to strongest correctly

Accepted Answer

E, C

Answer

B, A

Answer

D, B

Question 20

Which of the following is a true statement about the electric field between the two plates?

Accepted Answer

The field is attractive between the plates and uniform in strength

Answer

The field is repulsive between the plates and uniform in strength

Answer

The field is attractive between the plates and strongest near the positive

Answer

The field is repulsive between the plates and strongest near the positive

Question 21

Based on the arrangement of the electric field lines in the diagram, what are the charges?

Accepted Answer

both charges are the same

Answer

the charges are opposite

Answer

they are neutral; no charge

Question 22

Which diagram correctly shows the electric field around a negative charge?

Accepted Answer

B

Answer

A

Answer

they are both positive

Question 23

Coulomb's Law and Electric Fields

Accepted Answer

The force between two charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

Answer

The force between two charges is directly proportional to the square of the distance between them and inversely proportional to the product of their charges.

Answer

The force between two charges is directly proportional to the distance between them and inversely proportional to the square of the product of their charges.

Answer

The force between two charges is directly proportional to the square of the product of their charges and inversely proportional to the distance between them.

Question 24

Coulomb's Law and Electric Fields

Accepted Answer

Electric field lines start on positive charges and end on negative charges.

Answer

Electric field lines start on negative charges and end on positive charges.

Answer

Electric field lines can start and end on the same charge.

Answer

Electric field lines are always circular.

Coulomb's Law and Electric Fields

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