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A magnetic field of 2 xx 10^-2Wb//m^2act...

A magnetic field of `2 xx 10^-2Wb//m^2`actsat the right angles to a coil of area `100 cm^2` with 50 turns. The average e.m.f. induced in the coil is 0.1 V, when it is removed from the field in t sec, what is the value of t?

A

1sec

B

0.5sec

C

0.1sec

D

0.01sec

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CHETANA PUBLICATION-Electromagnetic Induction-EXERCISE
  1. The magnetic flux through a coil is 5 xx10^-4 Wb at time t = 0. It red...

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  2. Dimensional formula of magnetic flux is

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  3. A magnetic field of 2 xx 10^-2Wb//m^2actsat the right angles to a coil...

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  4. A rectangular coil of 25 turns, area of 25 cm^2 and resistance of 4 oh...

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  5. The magnetic flux in a coil is phi = 4t^2 + 4t + 4. What is the magnit...

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  6. A rod of length l is rotated about its one end, perpendicular to a mag...

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  7. A conducting circular loop is placed in a uniform magnetic field B = 0...

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  8. A 100 mH coil carries 1 A current .Energy stored in its magnetic field...

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  9. The current in a coil changes from 0 to 20 A in 0.5S. If the induced e...

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  10. Which one of the following is the unit of self inductance of a coil?

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  11. If L is the inductance and R is the resistance, then the unit of -L/R ...

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  12. The self inductance L of a solenoid of length l and area of cross-sect...

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  13. Which one of the following units denotes the dimensions ML^2//Q^2, whe...

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  14. What is the dimensional formula for the coefficient of self induction?

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  15. A coil is wound on a frame of rectangular crosssection. If all the lin...

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  16. A metal plate is getting heated. It can be because Which is the wrong ...

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  17. In a step up transformer, the input voltage is 300 V and the output vo...

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  18. A step down transformer works on 220 volts a.c. mains. It is used to l...

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  19. A transformer has 250 volts applied to the primary and gives 4.6V in t...

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  20. The number of turns in the primary and secondary coils of a transforme...

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