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A point charge +q is placed at origin O....

A point charge +q is placed at origin `O`. The work done in taking another point charge -q from the point A to point B along the circular arc as shown in the figure is .

A

`(-q^2)/(4pi varepsilon_0a)`

B

`(+q^2)/ (4√2pi varepsilon_0a)`

C

`(-√2q^2)/(4pi varepsilon_0a)`

D

Zero

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