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Question

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


  1. zero
  2. 10 units
  3. 100 units
  4. 1 unit

A
zero
B
1 unit
C
10 units
D
100 units
Solution
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Work done is given by W=qΔV
In the given problem, ΔV=0 as initial and final points are same. Hence, work done is zero.

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