2.4 A spherical conductor of radius 12 cm has a charge of 1.6 × 10–7C 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?
2.4 A spherical conductor of radius 12 cm has a charge of 1.6 × 10–7C 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?
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1 Answer
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2.4 Radius of the spherical conductor, r = 12 cm = 0.12 m
Uniformly distributed charge, q = 1.6 C
The electrical field inside the conductor is zero.
Electric field E just outside the conductor is given by
E = where = permittivity of free space = 8.854
E = = 99863.8 N N
At a point 18 cm from the centre of the sphere. Hence r = 18 cm = 0.18 m
From the above equation we get
E at 18 cm from the centre = = 4.438 N
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