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  4. A solenoid of length 10 cm and radius 1 cm contains 200 turns and carries a current of 10 A. The value of pole strength of each pole is

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Q. A solenoid of length $10 \,cm$ and radius $1 \,cm$ contains $200$ turns and carries a current of $10\, A$. The value of pole strength of each pole is

Magnetism and Matter

Solution:

$NIA = mL $
$\therefore m = NIA / L =200 \times \pi\left(10^{-2}\right)^{2} \times 10 / 0.1=2 \pi$