Revision: Electrostatics

14 Electrostatics - Revision Quiz

Test your understanding of Electrostatics here:

1 / 5

1) A large positively charged metal sphere is connected to a small negatively charged metal sphere by a piece of copper wire as shown below.

Which of the following statements is correct?

Both spheres are at the same electric potential after equilibrium is established.

The large sphere will acquire a net negative charge.

The charges on the small sphere will be neutralised.

A momentary conventional current will flow from the small sphere.

2 / 5

2) The following are the steps to charge an isolated metal ball by induction, but they are in the wrong order.

1 Remove the finger away from the metal sphere.
2 Touch the metal sphere with a finger.
3 Bring the positively charged rod near the metal sphere.
4 Remove the positively charged rod away from the metal sphere.

Which of the following shows the correct order?

2 - 1 - 3 - 4

3 - 2 - 1 - 4

2 - 3 - 4 - 1

3 - 2 - 4 - 1

3 / 5

3) A charged oil drop, p, remains stationary when placed between two charged plates as shown.

Which of the following conditions must be true?

Charge on p is negative.
Electrostatic force on p is equal to the weight of p.

Charge on p is positive.
Electrostatic force on p is greater than the weight of p.

Charge on p is negative.
Electrostatic force on p is greater than the weight of p.

Charge on p is positive.
Electrostatic force on p is equal to the weight of p.

4 / 5

4) Which of the following best describes how a conductor can be charged?

Place the conductor on an insulating stand, bring a charged rod near the conductor, earth the conductor, remove the charged rod and remove the earth connection.

Place the conductor on an insulating stand, bring a charged rod nearby, touch the conductor momentarily and remove the charged rod.

Hold the conductor in one hand and rub it with a high-friction cloth using the other hand.

Connect a wire between the conductor and a charged insulating rod.