Calculate the work done in moving a charge of $4$ coulombs from a point at $220$ volts to another point at $230$ volts.
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$V_1 = 220 V, V_2 = 230V$,
Charge moved $= 4C$
Thus, the potential difference $= V_2 - V_1 = 230 - 220 =10.$
We know that,
Work done = Potential difference $\times $ Charge moved
$= 10 \times 4$
Work done =$40$ joules.
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