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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
(146)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- For the normal eye, the cornea of eye provides a converging power of 40D
- Point masses m₁ and m₂ are placed at the opposite ends of a rigid rod of length L,
- A microscope is having objective of focal length 1 cm and eye-piece of focal length 6 cm.
- Two waves of same amplitude superpose. The resultant intensity is I₁
- An atom bomb weighing 1 kg explodes releasing 9×10¹³ J of energy.
Topics: Electrostatics (146)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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