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Question 25: NCERT Class 12th Physics: Chapter 1 – Electric Charges And Fields
An oil drop of 12 excess electrons is held stationary under a constant electric field of 2.55 × 104 N C-1 in Millikan’s oil drop experiment. The density of the oil is 1.26 g cm-3. Estimate the radius of the drop.
(g = 9.81 m s-2; e= 1.6 × 10-19 C)
Solution:
In equilibrium, force due to electric field on the drop balances the weight mg of drop
Check the complete chapter with solutions.
NCERT Solutions for 12th Class Physics: Chapter 1-Electric Charges And Fields