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(A) The electric potential $V$ at any point on a circle of radius $r$ due to a charge $q$ at its center is given by $V = \frac{kq}{r}$.Since the radiu

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(A) The electric potential $V$ at any point on a circle of radius $r$ due to a charge $q$ at its center is given by $V = \frac{kq}{r}$.Since the radius $r$ is constant for all points on the circle, the electric potential is the same at every point on the circumference.Therefore, the circle acts as an equipotential surface.The work done $W$ in moving a charge $q_0$ between two points with potential difference $\Delta V$ is given by $W = q_0 \Delta V$.Since the charge is moved around the circle once, the initial and final points are the same, so $\Delta V = 0$.Thus, the work done $W = 1 	imes 0 = 0\,units$.

There is $10$ units of charge at the centre of a circle of radius $10\,m$. The work done in moving $1\,unit$ of charge around the circle once is...........$units$.

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