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If the electric potential at point A is $20\;V$ and at $B$ is $– 40\; V$, then

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(A) The work done by an external force in moving an electron slowly from B to A is $-9.6 \times 10^{18} J$
(B) The work done by an electrostatic force in moving an electron slowly from B to A is $-9.6 \times 10^{-18} \;J$
answered Jun 10, 2014 by meena.p
 

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