The figure shows two protons (symbol p) and one electron (symbol e) on an axis. On the central proton, what is the direction of the force due to the electron?

• down

• right

• left

• up

The figure shows two protons (symbol p) and one electron (symbol e) on an axis. On the central proton, what is the direction of the force due to the proton?

• down

• right

• left

• up

The figure shows two protons (symbol p) and one electron (symbol e) on an axis. On the central proton, what is the direction of the net force?

• down

• right

• left

• up

Which equation defines Coulomb's Law?

• $F=G\ \frac{Mm}{r^2}$

• $F=G\ \frac{Mm}{r^{ }}$

• $F=\frac{1}{4\pi\epsilon_0}\frac{qQ}{r^2}$

• $F=4\pi\epsilon_0\ \frac{qQ}{r^2}$

The figures show four situations in which five charged particles are evenly spaced along an axis. The charge values are indicated except for the central particle, which has the same charge in all four situations. Which situation has the greatest magnitude of the net electrostatic force on the central particle?

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The figures show four arrangements of charged particles. Which of the arrangements has the greatest magnitude of the net electrostatic force on the particle with charge +Q? Select all correct answers.

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• 
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"Charge is quantized" means that...

• Charge is a quantity.

• Charge is a positive integer of $e$ .

• Charge is a negative integer of $e$ .
  

• Charge is a positive or negative integer of $e$ .
  

Initially, sphere A has a charge of -50e and sphere B has a charge of +20e. The spheres are made of conducting material and are identical in size. If the spheres then touch, what is the resulting charge on sphere A?

• +50e

• +70e

• -30e

• -15e

The figures show pairs of identical spheres that are to be touched together and then separated. The initial charges on them are indicated. Which of the pairs have the greatest magnitude of the charge transferred during touching?

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• All the same.

It is the electric force per unit charge.

• Electric field

• Electric potential

• Electric potential energy

• Electric potential difference.