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  4. If 50 joule of work must be done to move an electric charge of 2 C from a point, where potential is -10 volt to another point, where potential is V volt, the value of V is

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Q. If $50$ joule of work must be done to move an electric charge of $2\, C$ from a point, where potential is $-10$ volt to another point, where potential is $V$ volt, the value of $V$ is

Electrostatic Potential and Capacitance

Solution:

$50=2(V-(-10))$
$25=V+10$
$V=15 \,V$