The electric potential V at any point (x, y, z), all in meters in
space is given by V = 4x² volt. The electric field at the point
(1, 0, 2) in volt/meter is
(a) 8 along positive X-axis (b) 16 along negative X-axis
(c) 16 along positive X-axis (d) 8 along negative X-axis
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Explanation:
A solid sphereical conductor of radius R has a spherical
cavity of radius a (a < R) at its centre. A charge + Q is kept
at the centre. The cahrge at the inner surface, outer and at a
position r (a < r < R) are respectively
(a) + Q, – Q, 0 (b) – Q, + Q, 0
(c) 0, – Q, 0 (d) + Q , 0, 0
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