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If the length of a conducting wire be do...

If the length of a conducting wire be doubled by stretching, its resistance compared to the initial value will be :

A

2 times

B

4 times

C

8 times

D

equal

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • When the length and area of cross-section of a wire are doubled, then its resistance

    A
    will becomes half
    B
    will be doubled
    C
    will remain the same
    D
    will become four times

  • Statement I:IF a conducting wire is stretched to twice its length, the resistance became twice. Statement II: For a fixed wire, the resistance is proportional to its length.

    A
    Statement I is true,statement II is true,statement II is a correct explantion for statement I
    B
    Statement I is true,statement II is truel Statement II is not a correct explanation for statement I.
    C
    Statement I is true,statement II is false
    D
    Statement I is false, statement II is true.

  • The resistance R of a conducting wire depends on its material , length l and area of cross section A. The resistivity of the material of the wire is rho=(RA)/l the value of rho is for different materials .It is very low for conducting materials like metals,Besides, the resistance of a conductor also depends on its temperature. IF the resistance of a conductor is R_0 at 0^@C and R_1 at t^@C , then R_1=R_0(1+at) where a is called the temperature coefficient of resistance. The resistance increases with temperature for metallic conductors but decreases for graphite,a few metal alloys,and for semiconductors like silicon and germanium. The length of this metal wire is doubled by stretching .What will be the change in its resistance?

    A
    100% increase
    B
    200% increase
    C
    300% increase
    D
    500% increase

    • Similar Questions

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    Keeping the temperature and diameter constant the length of a wire is made thrice. What change in the resistance of the wire will be seen ?

    A metal wire has a resistances of 5 Omega . If its length is doubled by stretching,what would be its resistance? Suppose the volume and resistivity of the wire do not change.

    If a conducing wire is stretched to make itself twice longer then what change in the resistance of the wire will be seen if its resistivity and volume remain unchanged ?

    IF the length of a copper wire is increased by 0.1%, show that the resistance of the copper wire will increase by 0.2%.

    If a wire is stretched to make it 0.1% longer, its resistance will

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