Q.

A particle A having a charge of 2×10-6C and a mass of 100g is placed at the bottom of a smooth inclined plane of inclination 300. The distance of another particle of same mass and charge, be placed on the incline so that it may remain in equilibrium is

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a

45 cm

b

27 cm

c

16 cm

d

30 cm

answer is A.

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Detailed Solution

mg sinθ=14πε0q2r2

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