5. A wire of resistance “R” is stretched till its radius is half of the original value. The resistance of stretched wire is:
Question
Solution 1
The resistance (R) of a wire is given by the formula:
R = ρL/A
where: ρ is the resistivity of the material, L is the length of the wire, and A is the cross-sectional area of the wire.
When the wire is stretched, its volume remains constant. The volume of the wire can be given by the formula:
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