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Questions  

A charge Q is placed at the centre of a circle of radius R. The work done in moving a charge q from A to B so as to complete a semi-circle is :

a
Zero
b
Qq4ε0R
c
Qq2ε0R
d
Qq4ε0R2

detailed solution

Correct option is A

W = q (VB -VA)= 0 as VA= VB

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