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Q.

The electric field components in figure are Ex=bx,Ey=Ez=0. Calculate the flux through the cube.

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a

5-3ba5/2

b

ba5/2

c

2ba5/2

d

2-1ba5/2

answer is A.

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Detailed Solution

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Use Gauss’s law to calculate flux.

Ey=Ez=0  ϕy=0; ϕz=0

ϕx=a=-ba×a2; ϕx=2a=b2a×a2

ϕnet=(2-1)ba5/2

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