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  4. There is 10 units of charge at the centre of circle of radius 1 m. The work done in moving 1 unit of charge once around the circle is :

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

ManipalManipal 2003Electrostatic Potential and Capacitance

Solution:

Here charge at centre $=10$ units, radius of circle $(r)=10\, m$ and charge moved around circle $=1$ unit, we know that when the charge is at the centre of a circle, the circumference will be equipotential, so work done in moving a charge around the circle is zero.