A particle \( A \) having a charge of \( 2.0 \times 10^{-6} \mathrm{C} \) and a mass of \( 100 \...

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A particle \( A \) having a charge of \( 2.0 \times 10^{-6} \mathrm{C} \) and a mass of \( 100 \mathrm{~g} \) is fixed at the bottom of a smooth inclined plane of inclination \( 30^{\circ} \). Where should another particle \( B \) having same charge and mass, be placed on the inclined plane so that \( B \) may remain in equilibrium?
(a) \( 8 \mathrm{~cm} \) from the bottom
(b) \( 13 \mathrm{~cm} \) from the bottom
(c) \( 21 \mathrm{~cm} \) from the bottom
(d) \( 27 \mathrm{~cm} \) from the bottom
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