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(A) The work done in moving a charge $q$ from a point $A$ to $B$ in an electric field is given by $W = q(V_B - V_A)$,where $V_A$ and $V_B$ are the ele

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$K$

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(A) The work done in moving a charge $q$ from a point $A$ to $B$ in an electric field is given by $W = q(V_B - V_A)$,where $V_A$ and $V_B$ are the electric potentials at points $A$ and $B$ respectively.Since the charge $Q$ is at the centre of the circle,all points on the circumference of the circle $(P, L, M, N)$ are at the same distance from $Q$. Therefore,they are at the same electric potential.Moving a charge between any two points on the circumference ($P$ to $L$,$P$ to $M$,or $P$ to $N$) results in zero work done because the potential difference is zero.Point $K$ is outside the circle,meaning it is at a different potential than point $P$. Moving a charge from $P$ to $K$ involves a change in potential,resulting in non-zero work done. Thus,the work done is maximum when moving the charge to $K$.

In the figure,the charge $Q$ is at the centre of the circle. Work done is maximum when another charge is taken from point $P$ to:

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