Question

Two.Similar and equal charges repel each other with force 1.6n, when placed 3mapart.What will the strength of each charge.

Answer 1

Let q be charge on each particle and separation between them be 3m.

using Coulomb's law,

F = k$q_1q_2$/r²

here, F = 1.6N $q_1=q_2=q$ and r = 3m

so, 1.6 N = kq²/(3)²

putting k = 9 × 10^9 Nm²/C² [ experimental value ]

or, 1.6 × 9 = 9 × 10^9 q²

or, 16 × 10^-10 = q²

or, 4 × 10^-5 = q

hence, charge on each = 4 × 10^-5 C