Electric Charge Properties - UNSOLVED PRACTICE SET
Chapter: Electric Charges and Fields | Topic: Electric Charge Properties
ELECTRIC CHARGE PROPERTIES - UNSOLVED PRACTICE SET
Topic: Electric Charge Properties
Multiple Choice Questions
Q1. When a glass rod is rubbed with silk, the glass rod acquires a positive charge because:
- Protons are transferred from silk to glass
- Electrons are transferred from glass to silk
- Neutrons are transferred from glass to silk
- Both protons and electrons are transferred
Q2. According to the law of conservation of charge, in an isolated system:
- The total charge can increase
- The total charge can decrease
- The total charge remains constant
- The total charge becomes zero
Q3. A neutral body is rubbed with another neutral body. After rubbing, one body acquires a charge of +3 μC. The charge on the other body will be:
- +3 μC
- −3 μC
- Zero
- Cannot be determined
Q4. Which of the following is NOT a basic property of electric charge?
- Quantization
- Conservation
- Additivity
- Self-replication
Q5. The minimum amount of charge that can exist independently is:
- 1 C
- e = 1.6 × 10⁻¹⁹ C
- 1.6 × 10⁻¹⁸ C
- Zero
Q6. Two identical metallic spheres A and B have charges +6 μC and −2 μC respectively. When they are brought into contact and then separated, the charge on each sphere will be:
- +4 μC and +4 μC
- +2 μC and +2 μC
- +6 μC and −2 μC
- +8 μC and 0 μC
Short Answer Questions
Q7. State the law of conservation of charge with a real-life example.
Q8. What is meant by quantization of electric charge? Why can't we have a charge of 0.5e?
Q9. Explain the additive nature of electric charge with an example.
Q10. Why do we say that charge is a scalar quantity? How is the total charge on a system calculated?
Q11. A student rubs a plastic comb through her dry hair and notices that the comb attracts small pieces of paper. Explain this observation in terms of charge properties.
Q12. What happens to the charge on an ebonite rod when it is rubbed with fur? Which particle is actually transferred during this process?
Long Answer Questions
Q13. Explain the three fundamental properties of electric charge:
(i) Quantization,
(ii) Conservation, and
(iii) Additivity.
Give one example for each property from everyday observations.
Q14. Describe the process of charging by friction (rubbing). Why does a body become charged when rubbed with another body? Explain with the example of a comb rubbed through dry hair.
Q15. Two identical conducting spheres A and B have charges q₁ = +8 μC and q₂ = −4 μC respectively. They are brought into contact and then separated. Calculate the final charge on each sphere. If a third identical uncharged sphere C is now touched to sphere A and then removed, what will be the charge on each sphere?
Numerical / Application-Based Problems
Q16. In an experiment, a student rubs an ebonite rod with wool and finds that the rod acquires a charge of −3.2 × 10⁻¹⁹ C.
(a) How many electrons have been transferred from the wool to the ebonite rod?
(b) What is the charge acquired by the wool?
(c) If the student repeats the experiment and the rod now has a charge of −8.0 × 10⁻¹⁹ C, how many additional electrons were transferred?
[Given: e = 1.6 × 10⁻¹⁹ C]
Q17. A system consists of three point charges: q₁ = +5 μC, q₂ = −3 μC, and q₃ = +2 μC.
(a) Calculate the total charge of the system.
(b) If q₂ is removed from the system, what is the new total charge?
(c) Verify the law of conservation of charge for the entire process.
Q18. During a thunderstorm, a lightning bolt transfers 25 C of charge from a cloud to the ground in 0.002 seconds.
(a) Calculate the number of electrons transferred.
(b) If the cloud initially had a net positive charge of +50 C, what is its net charge after the lightning strike?
(c) Explain which property of electric charge is demonstrated in this phenomenon.
[Given: e = 1.6 × 10⁻¹⁹ C]