question_answer

Two parallel conducting plates 5mm apart are held horizontally one above the other. The upper plate is maintained at a positive potential of 15 kV while the lower plate is earthed. If a small oil drop of relative density 0.92 and of radius \[5\text{ }\mu m\] remains stationary between the plates, if the charge on the drop is Xe then find the value of x.

Answer:

(10)