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Q.

In an electrical circuit, a battery is connected to pass 20 C  of charge through it in a certain given time. The potential difference between two plates of the battery is maintained at  15 V. 
The work done by the battery is____ J. 

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answer is 300.

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Detailed Solution

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Given, 
Charge,  q=20 C, potential difference,  ΔV=15 V
Work done,  W=qΔV=20×15=300 J

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