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Ajeet Mohabir
Asked: 2022-11-02T08:23:04+05:30 In:

A wire of length `60 cm` is bent to into a circle with a gap of `1 cm`. At its ends, on heating it by `100^(0)C`, the length of the gap increases to `1.02 cm`. `alpha of materials of wire is
A. `2 xx 10^(-4//@)C`
B. `4 xx 10^(-4//@)C`
C. `6 xx 10^(-4//@)C`
D. `1 xx 10^(-4//@)C`

A wire of length `60 cm` is bent to into a circle with a gap of `1 cm`. At its ends, on heating it by `100^(0)C`, the length of the gap increases to `1.02 cm`. `alpha of materials of wire is
A. `2 xx 10^(-4//@)C`
B. `4 xx 10^(-4//@)C`
C. `6 xx 10^(-4//@)C`
D. `1 xx 10^(-4//@)C`
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1 Answer

  1. Correct Answer – A
    `alpha = (l_(2) – l_(1))/(l_(1)Deltat)` (gap can be taken as `l_(1)`)

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