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Question

A point positive charge of Q' unit is moved round another positive charge of Q unit on a circular path. If the radius of the circle is r, the work done on the charge Q' in making one complete revolution is:


  1. Q4πϵ0r
  2. 0
  3. QQ4πϵ0r
  4. Q4πϵ0r

A
QQ4πϵ0r
B
Q4πϵ0r
C
0
D
Q4πϵ0r
Solution
Verified by Toppr

We know potential at distance r=kQr
Now voltage is constant as r is constant
We know work done w=Δv υ
w=0 as Δv=0

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A point positive charge of Q' unit is moved round another positive charge of Q unit on a circular path. If the radius of the circle is r, the work done on the charge Q' in making one complete revolution is:


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