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Three copper wires of length and cross-s...

Three copper wires of length and cross-sectional areas are (L,A)`(2L,(A)/(2)),(L//2,2A)`, resistance is

A

wire of cross-sectional are `A/2`

B

wire of cross-sectional are A

C

wire of cross-sectional area 2A

D

same is all the three cases

Text Solution

Verified by Experts

The correct Answer is:
C
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MOTION-CURRENT ELECTRICITY-EXERCISE -2 (OBJECTIVE PROBLEMS NEET)
  1. The number of free electrons per 100 mm of ordinary copper wire is 2xx...

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  2. The length of a given cylindrical wire is increased by 100%. Due to th...

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  3. Three copper wires of length and cross-sectional areas are (L,A)(2L,(A...

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  4. When a piece of aliminium wire of finite length is drawn through a ser...

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  5. The resistivity of a wire depends on its

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  6. The conductivity of a super conductor is

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  7. A copper wire iis stretched to make it 0.1% longer. What is the percen...

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  8. A metal wire of resistance R is cut into three equal pieces that are t...

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  9. Masses of three wires of same metal are in the ratio 1:2:3 and their l...

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  10. As the temperature of a metallic resistor is increased,the product of ...

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  11. A bullet of mass 2 gm is having a charge of 2 muc. Through what potent...

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  12. What will be the equivalent resistance between the A and D ?

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  13. In the arrangement of resistances shown in the circuit. The potential...

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  14. Express which of the following set ups can be used to verify ohm's l...

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  15. The resistance across P and Q in the given figure is

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  16. Electromotive force of a cell is basically a

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  17. A battery of e.m.f. 10 V and internal resistance 0.5 ohm is connected ...

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  18. The resistance of the circuit between A and B is :

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  19. Two cells X and Y are connected to a resistance of 10Omega shown in th...

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  20. In a torch there are two cells each of 1.45 volt and 0.15 Omega . Each...

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