- #1

Sunanda

- 21

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Please refer to the image attached. So, my doubt is:

While calculating dW in the derivation, we know this work is being done by external force, because only then the unit positive charge can be made to move towards the charge +Q. So dW should be equal to

Isn't it?

Remarks: Here above, bold letters represent vector form.

While calculating dW in the derivation, we know this work is being done by external force, because only then the unit positive charge can be made to move towards the charge +Q. So dW should be equal to

**F**_{ext}.d**x**but here in the book it is shown equal to**E**.d**x**Isn't it?

Remarks: Here above, bold letters represent vector form.

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