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MHT CET 2021 (20 Sep, Shift 1) · Ampere's Law, Cylinders, Solenoid & Toroid

Ampere's Law, Cylinders, Solenoid & Toroid question from MHT CET 2021 (20 Sep, Shift 1)

Q39MHT CET 2021 · 20 SEP · SHIFT 1Easy

Ampere's Law, Cylinders, Solenoid & Toroid

The magnetic field intensity 'H' at the centre of a long solenoid having 'n' turns per unit length and carrying a current 'I', when no material is kept in it, is

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Answer: (c)

Inside a long solenoid $B = \mu_0 n I$ and $H = \dfrac{B}{\mu_0}$ .
$H = nI$ .
So the answer is (c) $nI$ .

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