JEE Main Physics question
A wire elongates by mm when a load hangs from it. If the wire goes over a pulley and two weights each are hung at the two ends, the elongation of the wire will be (in mm)
Answer: (A)
Solution
Draped over the pulley, the wire (total length ) is pulled with tension on each side, same as before, but now it consists of two halves each of length in series. Each half stretches
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