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The potential of a large liquid drop when eight liquid drops are combined is 20 V. Then the potential of each single drop was
Options
(a) 10 V
(b) 7.5 V
(c) 5 V
(d) 2.5 V
Correct Answer:
5 V
Explanation:
Volume of 8 drops = Volume of bigger drop
or, [(4/3) πr³] × 8 = (4/3) πR³ or 2r = R ——(i)
Charge is conserved. 8q = Q
.·. V’ = q / capacity = q / 4πε₀r
V = Q / capacity = Q / 4πε₀R
Then , V’ / V = (q / Q) × (R / r) or, V’ / 20 = (q / 8q) × (2r / r) = 1 / 4
or, V’ = 5 volt.
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Topics: Electrostatics
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Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The surface tension of soap solution is 0.03 N/m. The work done in blowing to form a soap
- A transformer having efficiency of 90% is working on 200 V and 3kW power supply
- The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain
- Two thin lenses of focal lengths f₁ and f₂ are in contact and coaxial.
- A body of mass 0.5 kg travels in a straight line with velocity v=a x³/², where
Topics: Electrostatics (146)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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