f a wire is stretched to make it 0.1 % longer, its resistanc
Question
f a wire is stretched to make it 0.1 % longer, its resistanc
Solution
To calculate the change in resistance of a wire when it is stretched by 0.1%, we can follow these steps:
- Determine the initial length of the wire. Let's call it L0.
- Calculate 0.1% of the initial length by multiplying L0 by 0.001. This will give us the amount of elongation, which we'll call ΔL.
- Find the initial resistance of the wire. Let's call it R0.
- Use the formula for the change in resistance of a wire due to its change in length: ΔR = R0 * α * ΔL, where α is the temperature coefficient of resistance.
- If the temperature coefficient of resistance is not given, assume it to be a constant value of
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