Question

what is the potential difference between the terminals of a battery if 250 joules of work is required to transfer 20 columns of charge from one terminal of battery to the other

Answer 1

W=Q*V
V=W/Q
V=250/20
V=12 .5
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Answer 2

We know that
V=W/Q
=250/20=12.5V
Potential difference=12.5V