Young’s modulus of two wires A and B are in the ratio 7 : 4. Wire A is 2 m long and has radius R. Wire A is 2 m long and has radius R. Wire B is 1.5 m long and has radius 2 mm. If the two wires stret…

Question

Young’s modulus of two wires A and B are in the ratio 7 : 4. Wire A is 2 m long and has radius R. Wire A is 2 m long and has radius R. Wire B is 1.5 m long and has radius 2 mm. If the two wires stretch by the same length for a given load, then the value of R is close to:

Accepted Answer

Correct answer: C. (c) JEE Main 2019 ∆_1= ∆_2 or Fl_1 r_1^2y_1= Fl_2 r_2^2y_2 or 2R^2 7= 1.52^2 4 ∴R=1.75mm

$Young’s modulus of two wires A and B are in the ratio 7 : 4. Wire A is 2 m long and has radius R. Wire A is 2 m long and has radius R. Wire B is 1.5 m long and has radius 2 mm. If the two wires stretch by the same length for a given load, then the value of R is close to:$

Solution

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