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NCERT Class XII Chapter
Electrostatic Potential and Capacitance
Questions With Solutions

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Question : 4
Total: 37
A spherical conductor of radius 12 cm has a charge of 1.6 × 10–7 C distributed uniformly on its surface. What is the electric field
(a) inside the sphere
(b) just outside the sphere
(c) at a point 18 cm from the centre of the sphere?
Solution:  
R = 12 cm, q = 1.6 × 10−7 C
(a) Ein = 0
(b) Eout =
1
4πε0
q
r2
 = 9 × 109 ×
1.6×10−7
(12×10−2)2
 or Eout = 1.0 × 105 N C−1
(c) Eon =
1
4πε0
q
R2
 = 9 × 109 ×
1.6×10−7
(12×10−2)2
 or Eon = 4.4 × 14 N C−1
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