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A coil of resistance 20Omega and self-i...

A coil of resistance 20`Omega` and self-inductance 5 H connected with battery 100 V. What will be the value of energy stored ?

A

31.25 J

B

62.5 J

C

125 J

D

250 J

Text Solution

Verified by Experts

The correct Answer is:
B
The energy stored in the coil
`=1/2LI^2`
`=1/2L[E/R]^2 " " [because I=E/R]`
`=1/2xx5xx[100/20]^2=1/2xx5xx25`=62.5 J
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KUMAR PRAKASHAN-ELECTROMAGNETIC INDUCTION-Section D MCQs (From DARPAN Based on Textbook )
  1. For an inductor having self inductance 4.6 H, emf induced in it for ti...

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  2. Find mutual inductance of two coaxial solenoids of equal length 30 cm ...

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  3. A coil of resistance 20Omega and self-inductance 5 H connected with b...

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  4. The unit of inductance is equivalent to …..

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  5. A solenoid has radius r and length l carries a current I. If the numbe...

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  6. Current I is following through a toroidal solenoid of radius r, length...

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  7. If N is the number of turns in a coil, the value of self inductance va...

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  8. If number of turns in a coil is increased from 10 to 100, its inductan...

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  9. Two inductors each of self-inductance L is connected in parallel. If t...

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  10. Mutual inductance of system of two coils is 0.3 H. If the current in t...

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  11. The flux linked with each turn of coil is 0.1 Wb and total number of t...

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  12. As shown in the figure, the planes of two concentric coils are mutuall...

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  13. Two circular coils can be arranged in any of the three situations as s...

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  14. X and Y coils are joined in a circuit in such a way that when the chan...

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  15. A circular coil of radius 5 cm has 500 turns of a wire. The approximat...

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  16. Mutual inductance of two coils can be increased by

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  17. Self inductance of straight conducting wire is

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  18. When current is increasing in the coil, the direction of induced emf i...

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  19. The self-inductance of a coil increases when the coil is wound on a so...

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  20. The frequency of A.C. mains in India is ….. Hz.

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