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Question

A long solenoid has 50 turns per meter of its length. If a current of 5 A is passed through it, then the magnetic field at the end of the solenoid will be nearly equal to

​​​​​​​[0.77 Mark]

A
0.16 mT
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B
1.2 mT
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C
1.67 mT
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D
4.23 mT
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Solution

The correct option is A 0.16 mT
The magnetic field due to a long solenoid at its end is given by,

B=μ0ni2

Where,
μ0 - Permeability of free space
n - Number of turns per unit length
i - Current passing through the solenoid

B=4π×107×50×52=0.157 mT=0.16 mT

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