The electric potential at point A is 20 ...

The electric potential at point A is 20 V and at B is `-40v`. Work done by an external force in moving an electron slowly from B to A.

`-9.6 times 10^(-18)`J

`9.6 times 10^(-18)` J

`96 times 10^(-18)` J

`-96 times 10^(-18)` J

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