SSC JE Electrical Engineering 24 Jan 2018 Evening Paper

Question : 127 of 200

Marks: +1, -0

What will be the value of current (in A) in a 40 cm long solenoid in free space, if it has 400 turns, 2 cm of diameter and produces a magnetic field of 4 mT at its center?

4.23
5.15
3.18
2.34

Validate

Solution:

Magnetic field Density ‘

β’ = 4 × 10^{– 3}T

L = length of solenoid

4 × 10^{– 3} × 40 × 10^{– 12}

= 4 × 3.14 × 10^{– 7 }× 400 I

I = 3.18 A

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