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Why is spark produced in the switch off a fan when it is put off?

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BINA LIBRARY-ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENT-EXERCISE
  1. What is an amplitude ?

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  2. Why are coils in resistance box double wounded?

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  3. Why is spark produced in the switch off a fan when it is put off?

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  4. A copper disc is allowed to swing through the two poles of a U-shaped ...

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  5. A light bulb is rated at 100W for a 220V supply. Find the peak voltage...

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  6. A light bulb is rated at 100W for a 220V ac supply. Calculate the resi...

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  7. A sinusoidal voltage V=200 sin 314t is applied to a resistor of 10 Ome...

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  8. A lamp is connected in series with a capacitor. Predict your observati...

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  9. Explain the principle on which the metal detector is used in airport f...

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  10. Which surface have more friction – rough or smooth ? Why ?

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  11. Give two examples where rolling friction is utilized

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  12. Name the two factors on which the magnitude of frictional force depend...

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  13. An inductor of reactance 10Ω and resistance 10Ω are connected in serie...

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  14. A capacitor and resistor are connected in series with an ac source. If...

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  15. Give two methods by which friction is reduced in the wheels of the car...

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  16. A source of alternating emf of 220 V and 50 Hz is connected in series ...

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  17. A rectangular coil having 60 turns and area of 0.4m^2 is held at rig...

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  18. sinusoidal voltage V = 200 sin 314 t is applied to a resistor of 10Ω. ...

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  19. A 3muF capacitor is connected to a 220V, 50 Hz a.c. source. Calculate ...

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  20. A capacitor of 50µF, a resistor of 102 and an inductor L are in series...

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