A particle A having a charge of 2×10^-6 Coulomb and a mass of 100g is fixed at the bottom of a smooth inclined plane of inclination 30 degree. Where should another particle B having same charge and mass, be placed on the inclined plane so that B may remain in equilibrium?

(a) 8cm from the bottom
(b) 13cm from the bottom
(c) 21cm from the bottom
(d) 27cm from the bottom

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