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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 )
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  7. A coil having N turns and area A is rotating in uniform magnetic field...

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  8. In an AC generator, the brushes in contact with the step rings alterna...

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  9. The equation of A.C. voltage is given by V = 158 sin 200pit. The value...

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  10. A coil with resistance 8 Omega and having 8 turns is connected with a...

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  11. For the situation shown in the figure, what should be the value of for...

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  12. For one coil, kept in 1T external magnetic field, current passing thro...

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  13. As shown in figure a bar magnet suspended by a conducting spring is ma...

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

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  15. The variation of induced emf E with time t in a coil when a short bar ...

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  16. Current of 2A passing through a coil of 100 turns gives rise to a magn...

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  17. A graph shown in the figure represents the variation of uniform magnet...

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  18. In AC generator, induced emf is zero at time t = 0. The induced emf at...

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  19. As shown in fig. a metal ring is held horizontally and a bar magnet is...

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  20. A conducting loop of resistance R is pulled in a uniform magnetic fiel...

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