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JEE Main201910 Apr 2019Evening ShiftPhysicsMechanical Properties of SolidsActual

The elastic limit of brass is 379 M P a . The minimum diameter of a brass rod if it is to support a 400 N load without exceeding its elastic limit will be

Options

  1. A1.00 m m
  2. B1.36 m m
  3. C1.16 m m
  4. D0.90 m m

Correct answer

C. 1.16 m m

Step-by-step solution

Stress = F A Elastic limit is 379   M P a ⇒ 379 × 10 6 = 400 A = 400 π d 2 / 4 d = 400 × 4 π × 379 × 10 6 = 1.16 × 10 - 3   m = 1.16   m m

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