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A metallic wire of resistance 40 Omega i...

A metallic wire of resistance `40 Omega` is stretched to twice its length. The new resistance approximately

A

`20 Omega`

B

`80 Omega`

C

`120 Omega`

D

`160 Omega`

Text Solution

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The correct Answer is:
D
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BINA LIBRARY-CURRENT ELECTRICITY-EXERCISE
  1. How many different combinations of three equal resistors can be made ?

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  2. A steady current flows in a metallic conductor of non uniform cross-se...

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  3. A metallic wire of resistance 40 Omega is stretched to twice its lengt...

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  4. A metallic wire is drawn to reduce its diameter to half its original v...

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  5. Three resistances each of 4 Omega are connected to form a triangle. Th...

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  6. Four wires of equal length and of resistance 10 Omega each are connect...

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  7. Assuming that the charge of an electron is 1.6 x 10^-19 C. The number ...

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  8. The electrical resistance of metals

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  9. The resistance of a conductor is 5 Omega at 50°C and 6 Omega at 100°C...

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  10. A piece of copper and another of germanium are cooled from room temera...

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  11. What is the order of the drift velocity of electrons?

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  12. A wire of 4 Omega resistance is bent at 180° at its mid point and twis...

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  13. A and B are two wires of copper of equal cross-section and A is longer...

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  14. If a wire of uniform cross sectional area is cut equally into two part...

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  15. Ampere second is the unit of

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  16. The temperature co-efficient of resistance of a wire is 0.00125 °C^-1....

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  17. Krichhoff's first law deals with conservation of

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  18. The instrument for accurate measurement of emf of a cell is

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  19. In a metre bridge, the balancing length from the left end is 20 cm. Th...

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  20. The sensitivity of a potentiometer can be increased by

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