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Electrostatics

Electric charges and fields chapter,
Answer is 2 nd option....
Explain it..

Question image for Electric charges and fields chapter, Answer is 2
Profile image of raju nagula
8 Years agoGrade
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2 Answers

Profile image of Venkat
8 Years ago
 
Net flux = flux of curved surface + flux of plane
Flux through plane = E*pi*r^2*cos 180 = - E*pi*r^2
Since the angle is 180 because direction of field lines is opposite to direction of area vector of plane surface. The field lines are in the direction of area vector of curved surface, that is , the hemispherical part or curved part.
 
Now flux through  curved surface area = 2E*pi*r2
Net flux  = 2E*pi*r2+ (- E*pi*r2) = E*pi*r2.
Hence option (B) is the answer.
Profile image of Rohit
8 Years ago
Flux(curved)+ flux(circular) =0.
Flux (curved) = -flux (circular).
Now we know flux = Edscos(x).
Hence, flux(curved)= -(EπR^2cos(180)).
We get the answer +πR^2E.
Hope it helps.
I have explained u in the simplest manner.
Approve if you are satisfied.
Regards.
Rohit.

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