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Q.

A spherical shell of radius R = 1.5 cm has a charge q=20μC uniformly distributed over it. The force exerted by one half over the other half is

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a

zero

b

10−2N

c

500 N

d

2000 N

answer is D.

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Detailed Solution

E=σ2ε0F=Edq=σdAσ2ε0P=FdA=σ22ε0 Force =PπR2=σ22ε0πR2=Q216π2R4πR22ε0=Q232πε0R2=20×10−62×9×10981.5×10−22=2000N
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