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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
(146)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Electrons in a certain energy level n=n₁, can emit 3 spectral lines. When they
- If c is the velocity of light in free space, the time taken by light to travel
- When a charged oil drop moves upwards in an electric field,
- A bomb of mass 30 kg at rest exploded into two pieces of masses 18 kg
- Three capacitors 3μF,6μF and 6μF are connected in series to a source of 120V.
Topics: Electrostatics (146)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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