Quiz about Electrostatics, Electric Fields and Coulomb's Law

Question 1

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 2

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 3

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 4

If the distance between two charges is halved, how does the force between them change according to Coulomb's Law?

Accepted Answer

It increases by four times

Answer

It is halved

Answer

It is quartered

Answer

It is doubled

Question 5

What does Coulomb's Law describe?

Accepted Answer

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

Answer

The relationship between electric current and magnetic fields

Answer

The rate of flow of electric charge

Answer

The resistance offered by a material to the flow of electric current

Question 6

According to Coulomb's Law, what happens to the force between two charges if the charge of one is tripled and the distance between them is also tripled?

Accepted Answer

The force remains unchanged

Answer

The force is tripled

Answer

The force is nine times greater

Answer

The force is reduced to one-third

Question 7

What is the unit of electric charge?

Accepted Answer

Coulomb

Answer

Joule

Answer

Newton

Answer

Ampere

Question 8

If each of the charges doubles, what happens to the electrostatic force?

Accepted Answer

Quadruples

Answer

Doubles

Answer

Stays the same

Answer

Reduced by half

Question 9

If a negatively charged rod touches a conductor, the conductor will be charged by what method?

Accepted Answer

Conduction

Answer

Friction

Answer

Induction

Answer

Convection

Question 10

Which of the following is NOT a property of electric charge?

Accepted Answer

Invisibility

Answer

Quantization

Answer

Conservation

Answer

Transferability

Question 11

True or false: Conservation of charge states that electrons may be destroyed when transferred from one material to another.

Accepted Answer

False

Answer

True

Question 12

A negatively charged particle is

Accepted Answer

An Electron

Answer

A Proton

Answer

A Neutron

Answer

A Negatron

Question 13

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 14

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

Accepted Answer

decreases

Answer

disapears

Answer

destroyed in a heartbeat

Answer

doubles

Question 15

What is the unit for electrostatic charge?

Accepted Answer

Coulombs

Answer

Newtons

Answer

Meters

Answer

Joules

Question 16

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

Accepted Answer

Meters

Answer

Joules

Answer

Coulombs

Answer

Newtons

Question 17

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 18

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 19

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 20

Before the balloons and sweaters are rubbed together, both objects are __________ charged. After they are rubbed together the sweater is __________ charged and the balloon is ___________ charged

Accepted Answer

neutral/positive/negative

Answer

negative/positive/negative

Answer

positive/negative/neutral

Answer

neutral/negative/positive

Question 21

What is the direction of the electric field at a point in space?

Accepted Answer

A) In the direction of the force on a positive test charge

Answer

B) Opposite to the direction of the force on a positive test charge

Answer

C) In the direction of the force on a negative test charge

Answer

D) Opposite to the direction of the force on a negative test charge

Question 22

Two point charges, $$q_1 = 5 \, \mu C$$ and $$q_2 = -3 \, \mu C$$ , are placed 0.2 meters apart. Calculate the magnitude of the electrostatic force between them using Coulomb's Law.

Accepted Answer

B) 1.6875 N

Answer

A) 3.375 N

Answer

C) 0.84375 N

Answer

D) 6.75 N

Question 23

Which of the following statements about electric field lines is true?

Accepted Answer

B) Electric field lines start on positive charges and end on negative charges

Answer

A) Electric field lines can cross each other

Answer

C) Electric field lines form closed loops

Answer

D) Electric field lines are always straight

Question 24

A charged particle is placed in a uniform electric field. What is the relationship between the force experienced by the particle and the electric field?

Accepted Answer

B) The force is directly proportional to the electric field

Answer

A) The force is inversely proportional to the electric field

Answer

C) The force is independent of the electric field

Answer

D) The force is equal to the electric field

Electrostatics, Electric Fields and Coulomb's Law

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