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In a conducting hollow sphere of inner and outer radii 5cm and 10cm. respectively, a point charge 1C is placed at point A, that is 3cm from the centre C of the hollow sphere. An external uniform electric field of magnitude $20 N C^{- 1}$ is also applied. Net electric force on this charge is 15N, away from the centre of the sphere as shown. Find the magnitude of net force exerted on the charge placed at point A by the induced charges on the sphere.

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20N

35N

15N

answer is D.

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Detailed Solution

$F = E Q = 20 N$

Given force is 15N,Net force =35N

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