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In the figure, magnetic energy stored in...

In the figure, magnetic energy stored in the coil is `

A

0

B

`oo`

C

25 joules

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
`U=1/2 xxLI^(2)`
`=1/2 xx2xx(10/2)^(2)`
`=1xx5^(2) =25 J`
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RESONANCE ENGLISH-ELECTROMAGNETIC INDUCTION-Exercise
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  2. The magnetic flux linked with a coil, in webers is given by the equati...

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  3. A metal conductor of length 1 m rotates vertically about one of its en...

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  4. The resistance of a coil is 5 ohm and a current of 0.2A is induced in ...

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  5. If the length and area of cross-section of an inductor remain same but...

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  6. Self-inductance of a solenoid depend on-

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  7. When current flowing in a coil changes from 3A to 2A in one millisecon...

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  8. In the figure, magnetic energy stored in the coil is

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  9. The self-inductance of solenoid of length L, area of cross-section S a...

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  10. Energy is stored in the choke coil in the form of :

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  11. The self-inductances of two identical coils are 0.1H. They are wound o...

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  12. The magnetic flux through Circuit of resistance R chages by an a...

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  13. A conducting circular loop is placed in a uniform magnetic field, B = ...

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  14. Which of the following is proportional to energy density in magnetic f...

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  15. When two co - axial coils having same current in same direction are b...

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  16. A magnetic field can be produced by

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  17. A bar magent is released into a copper ring directly below it . The ac...

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  18. Lenz's law gives:

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  19. Statement 1: Electric field produced by changing magnetic field is non...

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  20. Assertion Two concentric conducting rings of different radii are place...

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