What amount of work is done in moving a charge of 4 coulombs from a point 220 volts to a point at 230 volts?

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Solution

Potential difference between the two points $Δ V = 230 - 220$ Volts
$∴$ $Δ V = 10$ volts
Amount of charge moving $q = 4$ coulombs
Thus work done $W = q Δ V$
$∴$ $W = 4 \times 10 = 40$ Joules

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