The distance between the plates of a parallel plate condenser is 4 mm and potential difference is 60 volts. If the distance between the plates is increased to 12 mm, then

Options :
1. The potential difference of the condenser will become 180 volts
2. the P.D. will become 20 volts
3. The P.D. remain unchanged
4. none of the above

Explanation:

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