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a coil of 1200 turns and mean area of 50...

a coil of `1200` turns and mean area of `500 cm^(2)` is held perpendicular to a uniform magnetic field of induction `4 xx 10^(-4) T`. The resistance of the coil is `20` ohms. When the coil is rotated through `180^(@)` in the magnetic field in `0.1` seconds the average electric current (in `mA`) induced is :

A

12

B

24

C

36

D

48

Text Solution

Verified by Experts

The correct Answer is:
B
`E=(2NBA)/t,i=E/R`
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NARAYNA-ELECTROMAGNETIC INDUCTION-EXERCISE-1 (C.W)
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  2. A square loop of side 22 cm is changed to a circle in time 0.4 sec wit...

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  4. A closed coil with a resistance R is placed in a magnetic field. The f...

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  8. A metal conductor of length 1m rotates vertically about one of its end...

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  9. An air plane , with 20 m wingspread is flying at 250 ms^(-1) paralle...

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  13. A thin semicircular conducting ring of radius R is falling with its pl...

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  14. Two thick rods AB, CD are placed parallel to each other at a distance ...

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  15. A conducting ring of radius 'r' is rolling without slipping with a con...

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  16. A cycle wheel with 64 spokes is rotating with N rotations per second a...

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  17. A uniform circular metal disc of radius R is rotating about a vertical...

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  18. a copper disc of diameter 20 cm makes 1200 r.p.m. about its natural ax...

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  19. In an AC generator, a coil with N turns, all of the same area A and to...

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  20. A flat circular coil having N turns (tightly wound D) is placed in a t...

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