Question

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

Jun 30, 2016