Electric charges MCQs, Electric Charge and Fields MCQ Class 12

• Topic: Introduction + Electric charges
• Chapter: Electric Charge and Fields
• Number of Questions: 10
• Target: Class 12th Board Exam

Let’s Start

1. A glass is rubbed with a silk cloth. The glass rod requires a charge of +17.6 x 10^-19 C. Find the number of electrons lost by glass rod.

1. 12
2. 11
3. 10
4. 9

2. Which one of the following statements regarding electrostatics is wrong?

1. Charge is quantized
2. Charge is conserved
3. There is electric field near an isolated charge during motion
4. A stationary charge produces both electric and magnetic fields

3. What is the force between two small charged spheres having charges of 7 x 10^-7 C and 4 x 10^-7C placed 20 cm apart in air?

1. 63 x 10^-3 N
2. 53 x 10^-3 N
3. 65 x 10^-3 N
4. 67 x 10^-3 N

4. The electrostatic force on a small sphere of charge 0.5 C due to another small sphere of charge -0.6 C in air is 0.3 N. What is the distance between the two spheres?

1. (9 x 10⁹)^1/2
2. (8 x 10⁹)^1/2
3. (10 x 10⁹)^1/2
4. (7 x 10⁹)^1/2

5. Two insulated charged copper spheres A and B have their centres separated by a distance of 40 cm. What is the mutual force of electrostatic repulsion if the charge on each is 6 x 10^-7 C ? The radii of A and B are negligible compared to the distance of separation.

1. 2.025 x 10^-2 N
2. 3.25 x 10^-4 N
3. 1.25 x 10^-4 N
4. 4.25 x 10^-4 N

6. One quantum of charge should at least be equal to the charge in coulomb:

1. 1.6 x 10^-17 C
2. 1.6 x 10^-18 C
3. 1.6 x 10^-19 C
4. 1.6 x 10^-16 C

7. Objects A,B and C are three identical, insulated and spherical conductors. Originally A and B both have charges of +5mC, while C has a charge of -7mC. Objects A and C are allowed to touch, then they are moved apart. Then objects B and C are allowed to touch and they are moved apart.[Neglect effect due to induction]. If objects A and B are now held near each other, they will?

1. Attract
2. Repel
3. Have no effect on each other
4. None of the above

8. Is a charge of 5.8 x 10^-19 C possible ?

1. Possible
2. Not possible
3. Data not sufficient
4. None of the above

9. On rubbing which of the following will acquire negative charge ?

1. Glass rod
2. Fur
3. Nylon
4. Comb

10. A positively charged rod is brought near two uncharged metal spheres A and B attached with insulated stands and placed in contact with each other. What would happen if the rod is taken away from spheres ?

1. Both the spheres will become uncharged.
2. Both the spheres will become charged.
3. One sphere will be positively charged and other will be negatively charged.
4. No effect.