Discussion
Assertion (A) : Telephone wires sag more in summer.
Reason (R) : They expand due to summer heat.
Answer: A
Correct answer: Both A and R are true and R is the correct explanation of A.
Metals expand when heated, so in summer the wire between two poles becomes slightly longer while the poles stay where they are - and the extra length can only go into a deeper sag. The expansion is exactly the cause. Both are true and R explains A.
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