Page 32 - Electrostatics 11

Grade 11 © GC Shiba

plates. Calculate the number of electrons on the drop if it is stationary in
the air, neglecting the density of air.

Ans: 6
-6
13 A hollow spherical conductor of radius 12 cm is charged to 6 × 10 C. Find
the electric field strength at the surface of sphere, inside the sphere at 8

cm and at a distance 15 cm from the sphere.
6
5
Ans: 3.75 × 10 N/C, 0, 7.41 × 10 N/C
2
14 Two horizontal parallel plates each of area 500 cm are mounted 2 mm
apart in vacuum. The lower plate is earthen and the upper one is given a
positive charge of 0.05 . Find the electric field intensity and the potential

difference between the plates.

3
Ans: 112.9 × 10 V/m, 226 V

32 Electrostatics