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Explain the construction and working of a transformer. Derive an expression for ratio of emfs in terms of number of turns in primary and secondary coil (march 14,16 july 17).

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CHETANA PUBLICATION-Electromagnetic Induction-EXERCISE
  1. Explain the construction and working of a transformer. Derive an expre...

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  2. A magnetic flux associated with a coil changes by 5xx10^-2 Wb in 25 se...

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  3. The current in one coil increasesfrom0 to 500 mA in 0.1 ms. The induce...

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  4. An emf of 100 mV is induced in a conductor of length 1.2m when it move...

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  5. The current increases at the rate of 10A s^-1 in the coil of inductan...

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  6. The current in a coil changes from zero to 5A in 0.2 seconds, due to w...

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  7. The mutual inductance between the two coils is 2 xx 10^-2H.Due to the ...

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  8. A step down transformer, connected to mains supply 240V is made to ope...

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  9. The primary winding of a transformer has 300 turns and its secondary w...

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  10. A coil of effective area 10m^2 is placed at right angles to a magnetic...

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  11. The current increases at the rate of 10A s^-1 in the coil of inductan...

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  12. A coil of effective area 4m^2 is placed at right angles to a magnetic ...

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  13. A rectangular coil (0.5 m xx 0.4m) has a resistance of 5Omega . The co...

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  14. A rectangular coil (0.5 m xx 0.4m) has a resistance of 5Omega . The co...

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  15. A coil of area 0.75 m^2 and 1000 turns is kept perpendicular to a magn...

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  16. Find the self-inductance of a circuit in which an e.m.f. of 10V is ind...

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  17. The mutual inductance of a pair of coils is 0.75H. If the current in t...

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  18. A step down transformer has 800 turns in the primary. The supply volta...

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  19. A coil of effective area 2m^2 is placed at right angles to a magnetic ...

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  20. The back e.m.f. induced in an inductive coil is 100 V when the current...

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  21. The coefficient of mutual inductance between a pair of coils is 5mH. F...

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