Questions
The capacitance of a spherical condenser is 1 F, If the spacing between the two spheres is 1 mm, the radius of the outer sphere is
a
30 cm
b
3 cm
c
6 cm
d
3 m
detailed solution
Correct option is D
C=4πε0abb−aGiven C=1μF=1×10−6Fand (b−a)=1×10−3m∴ 1×10−6=19×109×b−1×10−3(b)1×10−39=b2−b×10−3≈b2∴ b=3 metreTalk to our academic expert!
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