NEET UG PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

1 Hard

1 of 1

Application +4 | -1

A brass wire 1.8 m long at

27^\circ C

is hold taut with little tension between two rigid supports. If the wire is curled to a temperature of

- 39^\circ C,

then tension developed in the wire if its diameter is 2.0 mm?

\left( {{\alpha _{{\text{brass}}}} = 2 \times {{10}^{ - 5}}/^\circ C,\,\,{Y_{{\text{brass}}}} = 0.91 \times {{10}^{11}}\,\,{\text{Pa}}} \right)

View answer and explanation

Correct option: A

3.8 \times {10^2}\,\,{\text{N}}

Option A (

3.8 \times {10^2}\,{\text{N}}

) is correct because it represents the tension developed in the wire due to thermal stress.

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