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Q.

A fully charged capacitor has a capacitance ‘C’. It is discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat capacity ‘s’ and mass ‘m’. If the temperature of the block is raised by 'ΔT', then the potential difference ‘V’ across the capacitor is

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a

mCΔTs

b

2msΔTC

c

2mCΔTs

d

2mCΔTs

answer is B.

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Detailed Solution

By law of conservation of Energy

12CV2=MSΔtV=2msΔtC

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