An oil drop of radius 2 mm with a density 3gcm?³ is held stationary under a constant electric field 3.55 × 10? Vm?¹ in the Millikan's oil drop experiment. What is the number of excess electrons that the oil drop will possess? Consider g = 9.81 m/s².
An oil drop of radius 2 mm with a density 3gcm?³ is held stationary under a constant electric field 3.55 × 10? Vm?¹ in the Millikan's oil drop experiment. What is the number of excess electrons that the oil drop will possess? Consider g = 9.81 m/s².
Option 1 -
1.73 x 10¹⁰
Option 2 -
48.8 x 10¹¹
Option 3 -
1.73 x 10¹²
Option 4 -
17.3 * 10¹⁰
Asked by Shiksha User
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1 Answer
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Correct Option - 4
Detailed Solution:qE = mg ⇒ neE = (4/3)πr³ρg
⇒ n = (4πr³ρg) / (3eE) = (4 × 3.14 × (2 × 10? ³ )³ × 3 × 10³ × 9.81) / (3 × 1.6 × 10? ¹? × 3.55 × 10? ) = 1.73 × 10¹?
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