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JEE Main202324 Jan 2023Evening ShiftPhysicsMagnetic Effects of CurrentActual

A long solenoid is formed by winding 70 turns cm - 1 . If 2 . 0 A current flows, then the magnetic field produced inside the solenoid is ______________. ( µ 0 = 4 π × 10 – 7 T m A – 1 )

Options

  1. A1232 × 10 – 4   T
  2. B176 × 10 – 4   T
  3. C352 × 10 – 4   T
  4. D88 × 10 – 4   T

Correct answer

B. 176 × 10 – 4   T

Step-by-step solution

Magnetic field inside solenoid = μ o n i where n = Number of turns per unit length n = 7000 turns/m B solenoid  = μ o n i = 4 π × 10 - 7 × 7000 × 2 = 8 × 22 7 × 10 - 6 × 7 × 100 = 176 × 10 - 4   T

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