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Q.

A rod of length l and radius r is bent into a ring of radius R with a cut which makes an angle of θ at the centre. If coefficient of thermal expansion is positive then on heating

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a

r and R increases but θ decreases

b

r, R and θall increases

c

r and R increases but θ remains same

d

r and R increases but θmay increase or decrease

answer is B.

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