Electrostatics A

When a rubber rod is rubbed with wool, the rod becomes negatively charged.What can you conclude about the magnitude of the wool’s charge after the rubbing process?

• The wool's charge will be larger than the charge on the rod.

• The wool's charge will be less than the charge on the rod.

• The wool's charge will be the same as the charge on the rod.

A typical lightning bolt has about 10.0 C of charge. How many excess electrons are in a typical lightning bolt?

• 6 x 10¹⁹

• 6 x 10^-19

• 6 x 10³¹

• 6 x 10^-31

A balloon rubbed against denim gains a charge of −8.0 µC.What is the electric force between the balloon and the denim when the two are separated by a distance of 8.0 cm? (Assume that the charges are located at a point.)

• 0.9 N

• 9 N

• 90 N

• 900 N

Two electrostatic point charges of +6.0 µC and +5.0 µC exert a repulsive force on each other of 300 N.What is the distance between the two charges?

• 0.3 cm

• 1 cm

• 3 cm

• 9 cm

By how much does the electric force between two charges change when the distance between them is doubled?

• 4

• 2

• 1/2

• 1/4

Two positive point charges, each of which has a charge of 2.5 × 10 ⁻⁹ C, are located at x =+0.50 m and x =−0.50 m. The magnitude and direction of the resultant electric force acting on a charge of 3.0 × 10⁻⁹ C located at x = 0.0 m is

• 25 N to the right

• 25 N to the left

• 30 N to the right

• 30 N to the left

• 0

In which direction will the electric force from the two equal positive charges move the negative charge shown below?

• To the North

• To the South

• To the South-West

• To the West

• To the North-West

When a conductor is charged by induction, the induced surface charge on the conductor

• is the same as the charge of the object inducing the surface charge

• is opposite to the charge of the object inducing the surface charge

• is zero

Calculate the net charge on a substance consisting of a combination of 17.0 × 10¹³ protons and 7.0 × 10¹³ electrons.

• + 16 Coulombs

• -16 Coulombs

• + 16 Micro-Coulombs

• -16 Micro-Coulombs

Shown are three separate pairs of point charges. Assume the pairs interact only with each other. Rank the magnitudes of the forces between the pairs, from largest to smallest

• Top, middle, bottom

• Middle, bottom, top

• Bottom, middle, top

• Middle, top, bottom