The electrostatic force on a small sphere of charge 0.4 µC due to another small sphere of charge –0.8 µC in the air is 0.2 N. The distance between the two spheres is:
1. 14 cm
2. 12 cm
3. 16 cm
4. 10 cm
Dimensional formula of is:
1. [M1L1T1]
2. [M0L1T1]
3. [M0L0T0]
4. [M-1L0T2]
Two insulated charged copper spheres A and B have their centers separated by a distance of 50 cm. What is the mutual force of electrostatic repulsion if the charge on each is ? The radii of A and B are negligible compared to the distance of separation.
1. 1.52 × 10−2 N
2. 3.7 × 10−2 N
3. 2.01 × 10−2 N
4. 2.23 × 10−1 N