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Q.

Expression for an electric field is given by E→=4000x2i^Vm . The electric flux through the cube of side 20 cm when placed in electric field (as shown in the figure) is ________V cm.

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answer is 640.

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Detailed Solution

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Electric flux is given by ϕ=E→.dS→

Flux through all faces except x=20 cm will be

 ϕ=4000×[0.2]2×[0.2]2 Vm
=6.4Vm=640Vcm 

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