The capacitance of a spherical condenser is 
. If the spacing between the two spheres is 1 mm, then the radius of the outer sphere is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Given: (b – a) = 1 × × 10 –3 m ..... (i)
and 
⇒ ⇒ 
⇒ ⇒ 
..... (ii)
From equations (i) and (ii)
⇒ ⇒ 1000 b 2 – b – 9000 = 0
⇒ ⇒ 
{Solving of quadratic equation}
⇒ ⇒ 
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