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What is back emf?...

What is back emf?

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What is back torque?

In potentiometer experiment, a cell of emf 1.25 V gives balancing length of 30 cm. If the cell is replaced by another cell, then balancing length is found to be 40 cm. What is the emf of second cell ?

A metallic wire coil is stationary in a uniform magnetic field. What is the e.m.f .induced in the coil?

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Why induced emf is called back emf?

What is the basic cause of induced e.m.f.?

In a potentiometer arrangement, a cell of emf 1.25 V gives a balance point at 35.0 cm length of the wire. If cell is replaced by another cell and the balance point shifts to 63.0 cm, what is the emf of the second cell?

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CHETANA PUBLICATION-Electromagnetic Induction-EXERCISE
  1. What is back emf?

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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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