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 ......... $V$
A$5$
B$-15$
C$+15$
D$+10$
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C$+15$
c (c)
$50=2(V-(-10))$
$25=V+10$
$V=15 \,V$
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