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The work done in slowly moving an electr...

The work done in slowly moving an electron of charge e and mass m from A to B along semicircular path (as shown in the figure ) in vertical plane in the field of charge Q is .

A

`- 2 mgr`

B

`- ( Qe)/(r )`

C

`2 mgr ( 2Q e)/( r)`

D

Zero

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