Electrostatics

The force per unit charge is known as

• electric flux

• electric field

• electric potential

• electric current

Which one of the following is the unit of electric field?

• Volt

• coulomb

• N/C

• coulomb-meter

Charge is

• transferable

• associated with mass

• conserved

• All of these

If your socks have an equal amount of electrons and protons, they are

• neutral

• positively charged

• negatively charged

• stinky

Which is the value of the constant in Coulomb's equation?

• k = 9·10^-9

• k = 9.8

• k = 6.67·10^-11

• k = 9 ·10⁹

Two charges separated by a distance of 1 meter exert a 20-N force on each other. If the charges are pulled to a 2 meter separation distance, the force on each charge will be 

• 10 N
• 5 N
• 2.5 N
• 40 N

A point charge (q1) has a magnitude of 3x10^-6 C. 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.

• -4.52 x 10^-3 N

• -83 N

• -2.81 N

• -9 x 10³ N

A 5 C and 8 C charge give off a force of 2.5 x 10⁹ N. What is the distance between them?

• 11 m

• 12 m

• 121 m

• 144 m

Two electrically neutral metal spheres, A and B, on insulating stands are placed in contact with each other. A negatively charged rod is brought near, but does not touch the spheres, as shown in the diagram below. How are the spheres now charged?

• A is positive and B is positive.
• A is negative and B is positive.
• A is positive and B is negative.
• A is negative and B is negative.

What happens to the force between two charged objects if you double the distance between them and double the magnitude of one charge?

• 4X
• 6X
• 1/2X
• 1/6X