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Assertion : Bending a wire does not effe...

Assertion : Bending a wire does not effect electrical resistance.
Reason : The resistance of wire is proportional to the resistivity of material.

A

If both the assertion and reason are true and reason is a true explanation of the assertion.

B

If both the assertion and reason are true but the reason is not the correct explanation of assertion.

C

If the assertion and reason are false

D

If both the assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
A
(a) Resistance wire `R = rho (l)/(A)` where `rho` is resistivity of material which does not depend on the geometry of wire. Since when wire is banded, resistivity, length and area of cross-section do not change, therefore resistance of wire also remain same.
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Knowledge Check

  • The resistance of a wire is

    A
    directly proportional to its area of cross-section
    B
    inversely proportional to its area of cross-section
    C
    independent of its area of cross-section
    D
    proportional to square of its area of cross-section

  • The resistivity of a wire

    A
    Increases with the length of the wire
    B
    Decreases with the area of cross-section
    C
    Decreases with the length and increases with the cross-section of wire
    D
    None of the above statement is correct

  • The resistivity of a wire

    A
    Varies with its length
    B
    Varies with its mass
    C
    Varies with it cross section
    D
    Is independent of length, cross section and mass of the wire

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