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A projector lamp can be used at a maximu...

A projector lamp can be used at a maximum voltage of 60V, its resistance is `20Omega`, the series resistance (in ohm) required to operate the lamp from a 75 V supply is 

A

2

B

3

C

4

D

5

Text Solution

Verified by Experts

The correct Answer is:
D
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AAKASH SERIES-CURRENT ELECTRICITY-EXERCISE - II
  1. The effective resistance between A and B in the given circuit is

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  2. The effective resistance in series combination of two equal resistance...

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  3. A projector lamp can be used at a maximum voltage of 60V, its resistan...

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  4. The temperature coefficient of resistivity of material is 0.0004/k. Wh...

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  5. When two identical wires made of different materials having resistivit...

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  6. Two metal wires of identical dimensions are connected in series. If si...

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  7. Heat produced in a conductor of resistance 4.2Omega with 10A current i...

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  8. A resistance coil of 60Omega is immersed in 42 kg of water. A current ...

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  9. Two bulbs whose resistances are in the ratio of 1 : 2 are connected in...

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  10. Which of the four resistances P,Q,R and S generate the greatest amount...

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  11. What is the ratio of heat generated in R and 2R

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  12. A 5^(0)C rise in the temperature is observed in a conductor by passing...

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  13. For ensuring dissipation of same energy in all three resistors (R(1), ...

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  14. The intemal resistance of a 2.1 V cell which gives a current of 0.2 A ...

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  15. The emf of a daniel cell is 1.08V. When the terminals of the cell are ...

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  16. A primary cell has an e.m.f, of 1.5 V, when short circuited it gives a...

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  17. If the external resistance is equal to the internal resistance of a ce...

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  18. Four cells each of emf 2V and internal resistance 1 ohm are connected ...

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  19. A student is asked to connected four cells of e.m.f of 1 V and interna...

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  20. 12 cells of each e.m.f 2V are connected in series among them, if 3 cel...

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