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The magnetic flux through a coil is 5 xx...

The magnetic flux through a coil is `5 xx10^-4` Wb at time t = 0. It reduces to ten percent of its original value in 0.5s. The magnitude of e.m.f. induced in the coil is

A

0.9mV

B

0.45mV

C

2mV

D

5mV

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CHETANA PUBLICATION-Electromagnetic Induction-EXERCISE
  1. A straight conductor of length 0.4 m is moving with a velocity of 7m//...

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  2. A metal rod of length lm, rotates about its one end in a plane at righ...

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  3. The magnetic flux through a coil is 5 xx10^-4 Wb at time t = 0. It red...

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  4. Dimensional formula of magnetic flux is

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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