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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
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The cylindrical tube of a spray pump has radius R, one end of which has n fine holes,
- A transformer rated at 10 kW is used to connect a 5 kV transmission line to a 240 V
- If the momentum of electron is changed by P, then the de-Broglie wavelength
- A projectile is thrown in the upward direction making an angle of 60°with the horizontal
- The identical cells connected in series are needed to heat a wire of length one meter
Topics: Electrostatics (146)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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