NEET-XII-Physics
02: Electrostatic Potential And Capacitance
- #4-aInside the sphere
(b) Just outside the sphere
(c) At a point 18 cm from the centre of the sphere?Ans : Radius of the spherical conductor, r = 12 cm = 0.12 m
Charge is uniformly distributed over the conductor, q = 1.6 × 10-7 C
Electric field inside a spherical conductor is zero. This is because if there is field inside the conductor, then charges will move to neutralize it.
(b) Electric field E just outside the conductor is given by the relation,
Where,
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= Permittivity of free space
Therefore, the electric field just outside the sphere is
.
(c) Electric field at a point 18 m from the centre of the sphere = E1
Distance of the point from the centre, d = 18 cm = 0.18 m
Therefore, the electric field at a point 18 cm from the centre of the sphere is
.
- #4-bJust outside the sphereAns : Electric field E just outside the conductor is given by the relation,
Where,
= Permittivity of free space
Therefore, the electric field just outside the sphere is.
- #4-cAt a point 18 cm from the centre of the sphere?Ans : Electric field at a point 18 m from the centre of the sphere = E1
Distance of the point from the centre, d = 18 cm = 0.18 m
Therefore, the electric field at a point 18 cm from the centre of the sphere is
.