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Question

There is an electric field E in the x-direction. If the work done by the electric field in moving a charge of 0.2C through a distance of 2m along a line making an angle 60 with the x-axis is 4J, then what is the value of E?

A
3NC1
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B
4NC1
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C
5NC1
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D
20NC1
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Solution

The correct option is D 20NC1
F=qE
work will only be done in moving the charged particle in x direction
work done in moving the charge in y-direction will be 0
Work done , W=F.dr

W=qE×2cos60
or 4=0.2E×2×12

E=20NC1

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