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Question: Answered & Verified by Expert
A solenoid has length 0.4 cm, radius 1 cm and 400 turns of wire. If a current of 5 A is passed through this solenoid, what is the magnetic field inside the solenoid?
PhysicsMagnetic Effects of CurrentNEET
Options:
  • A 6.28×10-4 T
  • B 6.28×10-3 T
  • C 6.28×10-7 T
  • D 6.28×10-6 T
Solution:
1181 Upvotes Verified Answer
The correct answer is: 6.28×10-3 T
The magnetic field inside the solenoid is given by

B=μ0ni0

(n = Number of turns per unit length, I = Current in coil)

Where n=NL.r

n=5000.4×10-2×1×10-2

n=1000

μ0=4π×10-7 Tm/A

B=4×3.14×1000×5×10-7

=62800×10-7

=6.28×10-3 T

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