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(D) The work done $W$ in moving a charge $q_0$ from point $A$ to point $C$ in the presence of a source charge $Q$ at $B$ is given by $W = q_0(V_C - V_

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Zero

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(D) The work done $W$ in moving a charge $q_0$ from point $A$ to point $C$ in the presence of a source charge $Q$ at $B$ is given by $W = q_0(V_C - V_A)$.Here,the source charge is $Q$ at $B$. The distance $BA = l$ and $BC = l$.The electric potential at point $A$ due to charge $Q$ is $V_A = \frac{1}{4\pi \varepsilon_0} \frac{Q}{l}$.The electric potential at point $C$ due to charge $Q$ is $V_C = \frac{1}{4\pi \varepsilon_0} \frac{Q}{l}$.Since $V_A = V_C$,the potential difference $\Delta V = V_C - V_A = 0$.Therefore,the work done $W = (-q) 	imes (0) = 0$.

$A$ charge $(-q)$ and another charge $(+Q)$ are kept at two points $A$ and $B$ respectively. Keeping the charge $(+Q)$ fixed at $B$,the charge $(-q)$ at $A$ is moved to another point $C$ such that $ABC$ forms an equilateral triangle of side $l$. The net work done in moving the charge $(-q)$ is

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