Question

Two wires a and b of the same material have radii in the ratio 2:1 and lengths in the ratio 4:1. Find the ratio of the normal forces required to produce the same change in the lengths of the two wires

Answer 1

Answer:

Two wires 'A' and 'B' of the same material have radii in the ratio `2:1` and lengths in the ratio `4:1`. The ratio of the normal forces required to produce the same change in the lengths of these two wires is. NTA NEET 2020 notification released for 15 per cent AIQ state of eligibility.

Answer 2

Stress=Fa

a=πr2

a∝r2

a1a2=(r1r2)2=(21)2

⇒4

S1S2=F/a1F/a2=(a2a1)=14

Ratio of stress is 1 : 4