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Length of one metal rod is 1m. 2T is the...

Length of one metal rod is 1m. 2T is the intensity of the magnetic field. When this rod is rotating with the frequency of 10 Hz perpendicular to the field line by keeping its one end fixed as centre, induced emf is ……

A

10`pi`V

B

`20piV`

C

`30piV`

D

`40piV`

Text Solution

Verified by Experts

The correct Answer is:
B
`epsilon=(BomegaL^2)/2`
`=(Bxx2pifxxL^2)/2`
`=(2xx2pixx10xx(1)^2)/2`
`=20pi`
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KUMAR PRAKASHAN-ELECTROMAGNETIC INDUCTION-Section D MCQs (From DARPAN Based on Textbook )
  1. When a metallic rod falls freely, keeping its length horizontal and pa...

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  2. One magnet is moved towards a coil, first speedily and then slowly. Th...

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  3. Length of one metal rod is 1m. 2T is the intensity of the magnetic fie...

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  4. rule is used to find the direction of induced current in a conducting ...

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  5. When a bar magnet is placed on the axis of a coil with north pole faci...

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  6. When current passing through a coil increases, direction of induced em...

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  7. When a bar magnet is brought closer to a coil, emf generated in the co...

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  8. Faraday's law on electromagnetic induction gives

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  9. The Lenz's force acting on a conducting rod is

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  10. Lenz's law is statement of

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  11. According to the Faraday's law of electromagnetic induction

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  12. The direction of induced emf during electro magnetic induction is give...

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  13. In figure a rectangular loop is being pulled to the right, away from t...

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  14. The earth's magnetic field at a place with zero declination is 3xx 10^...

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  15. A helicopter is moving in upward direction with speed of 10 m/s. If th...

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  16. A conducting rod of length I and velocity v moves in a magnetic field ...

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  17. The distance between two extreme points of two wings of an Aeroplane i...

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  18. A D.C. motor working on 200V have initial current of 5A but when it at...

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  19. A straight line conductor of length 0.4 m is moved with a speed of 7 m...

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  20. A square (each side of length L) wire loop is kept with a long straigh...

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