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Question

An electric field E=4x ^i(y2+1) ^j N/C passes through the box shown in figure. The flux of the electric field through surface ABCD and BCGF are marked as ϕ1 and ϕ11 respectively. The difference between (ϕ1ϕ11) is (in NM2/C)


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Solution

Flux of the electric field E through any area A is defined as
ϕ=EA=EAcosθ
Here, θ= angle between electric field and area vector of a surface
For surface ABCD Angle θ=90
ϕ1=E.Acos90=0
For surface BCGF ϕ11=EdA
ϕ11=[4x^i(y2+1)^j]4^i=16x=16×3
ϕ11=48 Nm2C
ϕ1ϕ11=48

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