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A semicircular metal ring subtends an angle of $180^{\circ} C$ at the centre of circle. When it is heated, this angle

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remains constant

increases slightly

decreases slightly

become $360^{\circ} C$

answer is A.

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Detailed Solution

When the semicircular metal ring is heated, it expands outwardly. The hole inside it also expands in the same ratio. Hence the angle at the centre remains the same i.e. 180 degree.

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