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The electric potential at a point in free space due to a charge Q coulomb is Q x 10¹¹ volts. The electric field at that point is
Options
(a) 4π?￢ﾂﾀQ x 10²² volt/m
(b) 12π?￢ﾂﾀQ x 10²⁰ volt/m
(c) 4π?￢ﾂﾀQ x 10²⁰ volt/m
(d) 12π?￢ﾂﾀQ x 10²² volt/m
Correct Answer:
4π?￢ﾂﾀQ x 10²² volt/m
Explanation:
Given that V = Q x 10¹¹ volts Electric potential at point is given by
V = 1 / 4π?￢ﾂﾀ . Q/r or,
Q x 10¹¹ = 1 / 4π?￢ﾂﾀ . Q/r
r = 1 / 4π?￢ﾂﾀ.10⁻¹¹ m.
As |E| = |V| / r = Q x 10¹¹ / (1 / 4π?￢ﾂﾀ.10⁻¹¹)
= 4π?￢ﾂﾀQ x 10²² volt/m
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Topics: Electrostatics
(146)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In the experiment for determination of velocity of sound in air,
- Starting from the origin, a body oscillates simple harmonically with a period of 2s
- If the momentum of electron is changed by P, then the de-Broglie wavelength
- In a n-p-n transistor about 10¹⁰ electrons enter the emitter in 2 μs,
- A ball rolls off the top of stair way with a horizontal velocity of magnitude 1.8 m/s
Topics: Electrostatics (146)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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