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A wire of resistance 4 Omega is stretche...

A wire of resistance `4 Omega` is stretched to twice its original length. The resistance of stretched wire would be

A

`2Omega`

B

`4Omega`

C

`8Omega`

D

`16Omega`

Text Solution

Verified by Experts

The correct Answer is:
D
As resistance, `R'=n^(2)R=2^(2)xx4=4 = 16 Omega`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-CURRENT ELECTRICITY-EXERCISE 1
  1. A wire of resistance 4 Omega is stretched to twice its original length...

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  2. A current 4.0 A exist in a wire of cross-sectional area 2.0 mm^(2). If...

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  3. With the rise of temperature the resistivity of a semiconductor

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  4. A carbon film resistor has colour green, black, violet and gold . The ...

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  5. Two wires of the same material but of different diameters carry the sa...

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  6. For a metallic wire, the ratio V/i ( V= applied potential difference a...

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  7. Two conductors are made of the same material and have the same length....

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  8. Two wires of the same dimensions but resistivities rho(1) and rho(2) a...

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  9. A material 'B' has twice the specific resistance of 'A'. A circular wi...

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  10. The resistance of a 10 m long wire is 10 Omega. Its length is increase...

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  11. Calculate the average drift speed of conduction electrons in a copper ...

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  12. The resistance of a bulb filmanet is 100Omega at a temperature of 100^...

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  13. All the edges of a block with parallel faces are unequal. Its longest ...

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  14. Two copper wire of length l and 2l have radii, r and 2r respectively. ...

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  15. Which of the following materials is the best conductor of electricity ...

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  16. Electric field (E) and current density (J) have relation

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  17. The temperature (T) dependence of resistivity (rho) of a semiconductor...

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  18. A current 4.0 A exist in a wire of cross-sectional area 2.0 mm^(2). If...

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  19. A wire of resistance R is elongated n-fold to make a new uniform wire....

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  20. The four colours on a resistor are: brown, yellow, green and gold as r...

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