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A parallel plate capacitor as a uniform electric field E in the space between the plates. If the distance between the plates is d and area of each plate is A, the energy stored in the capacitor is:
Options
(a) 1/2 ?￢ﾂﾀ E²
(b) E² Ad / ?￢ﾂﾀ
(c) 1/2 ?￢ﾂﾀ E² Ad
(d) ?￢ﾂﾀ E Ad
Correct Answer:
1/2 ?￢ﾂﾀ E² Ad
Explanation:
The energy stored by capacitor U = 1/2 CV²
…(i)
V is the p.d. between two plates of the capacitor.
The capacitance of the parallel plate capacitor V = E.d. C = A ?￢ﾂﾀ / d
Substituting the value of C in equation (i)
U = 1/2 A ?￢ﾂﾀ / d (Ed)²
= 1/2 ?￢ﾂﾀ E² Ad
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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
- In n-type semiconductor, electrons are majority charge carriers
- As a light wave travels from one medium to another which of its following properties
- When an object is placed 40cm from a diverging lens, its virtual image is formed 20 cm
- An isolated sphere has a capacitance of 50pF. What would be the radius of the sphere?
- Three resistances P,Q,R each of 2Ω and an unknown resistances S form the four arms
Topics: Electrostatics (146)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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