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Shown in the figure is a circular loop o...

Shown in the figure is a circular loop of radius, r and resistance R. A variable magnetic field of induction `B=e^(-t)` is established inside the coil. If the key (K) is closed at t=0 , the electrical power developed at the instant is equal to

A

`(B_(0)^(2)pi r^(2))/(R)`

B

`(B_(0)^(2)pi r^(2))/(R)`

C

`(B_(0)^(2)pi^(2) r^(4)R)/(5)`

D

`(B_(0)^(2)pi^(2) r^(4))/(R)`

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AAKASH SERIES-ELECTROMAGNETIC INDUCTION-EXERCISE-III
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  8. A rectangulare loop of length l and breadth b is placed at distance of...

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  9. A conducting square frame of side .a. and a long straight wire carryin...

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  10. If current is decreasing at a rate of 1000 As^(-1) p.d. between A and ...

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  11. A coil is wound on a rectangular frame. Keeping the number of turns pe...

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  12. When the current in the portion of the circuit shown in the figure is...

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  13. A small square loop of wire of side l is placed inside a large square ...

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  14. The coefficient of mutual induction between two coils is 4H. If the cu...

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  15. A 50 Hz AC current of crest value 1 A flows through the primary of a t...

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  16. Two coils have self-inductance L(1)=4mHandL(2)=1mH respectively. The c...

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  17. A short-circuited coil is placed in a time-varying magnetic field. Ele...

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  18. Shown in the figure is a circular loop of radius, r and resistance R. ...

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  19. A uniform magnetic field is restricted within a region of radius r. Th...

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  20. A magnetic flux through a stationary loop with a resistance R varies d...

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