A long solenoid of radius 1 mm has 100 turns per mm . If 1 A current flows in the solenoid, the magnetic…

A long solenoid of radius 1 mm has 100 turns per mm. If 1 A current flows in the solenoid, the magnetic field strength at the centre of the solenoid is:
  1. 12.56×10-2 T
  2. 12.56×10-4 T
  3. 6.28×10-4 T
  4. 6.28×10-2 T

Solution

Radius =1 mm

N=100 turns per mm

Current =1 A

Magnetic field strength at the centre of the solenoid is,

B=μ0ni=4π×10-7×100×103×1⇒B=12.56×10-2 T

Asked in: MHT CET Full Test 9

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