# Capacitance

### Explanation of question 1

The parallel plates of a capacitor are separated by 2mm of air. If this separation is increased to 4 mm, the new value of capacitance will be

1. four times the original capacitance
2. double the original capacitance
3. one-half the original capacitance
4. one-quarter the original capacitance

The answer is :- 3 C 1 / (distance between plates)

Therefore, if the distance is doubled, C must be halved.

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