NEET-XII-Physics
01: Electric Charges And Fields
- #1What is the force between two small charged spheres having charges of 2 × 10-7 C and 3 × 10-7 C placed 30 cm apart in air?Ans : Repulsive force of magnitude 6 × 10-3 N
Charge on the first sphere, q1 = 2 × 10-7 C
Charge on the second sphere, q2 = 3 × 10-7 C
Distance between the spheres, r = 30 cm = 0.3 m
Electrostatic force between the spheres is given by the relation,
$$ F = \frac{q_1q_2}{4\pi\epsilon_0r^2} $$
Where, `` \epsilon``0 = Permittivity of free space
Hence, force between the two small charged spheres is 6 × 10-3 N. The charges are of same nature. Hence, force between them will be repulsive.