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MHT CET 2025 (25 Apr, Shift 1) · Ampere's Law, Cylinders, Solenoid & Toroid

Ampere's Law, Cylinders, Solenoid & Toroid question from MHT CET 2025 (25 Apr, Shift 1)

Q13MHT CET 2025 · 25 APR · 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 ( $\mu_0 =$ permeability of free space)

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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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