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The total number of electric field lines crossing an area placed normal to the electric field is termed as electric flux. Electric flux is a scalar quantity, its SI unit is Nm 2 C –1 . Electric flux does not depend on the size and shape of object. In this case, as the charge enclosed is same there will be no net change in the electric flux coming out of the surface.

Electric Charges and Fields

Question

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Define electric flux. Write its S.I. unit. A spherical rubber balloon carries a charge that is uniformely distributed over its surface. As the balloon is blown up and increase in size, how does the electric flux coming out of the surface change? Give reason.

Answer

The total number of electric field lines crossing an area placed normal to the electric field is termed as electric flux.
Electric flux is a scalar quantity, its SI unit is Nm² C^–1.
Electric flux does not depend on the size and shape of object. In this case, as the charge enclosed is same there will be no net change in the electric flux coming out of the surface.