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MHT CET 2026 (20 Apr, Shift 1) · Ampere's Law, Cylinders, Solenoid & Toroid

Ampere's Law, Cylinders, Solenoid & Toroid question from MHT CET 2026 (20 Apr, Shift 1)

Q9MHT CET 2026 · 20 APR · SHIFT 1Easy

Ampere's Law, Cylinders, Solenoid & Toroid

A long solenoid carrying a current produces a magnetic field ' $B$ ' along its axis. If the current is tripled and the number of turns per cm is halved then new value of magnetic field will be

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Answer: (c)

$B = \mu_0 n I \propto nI$ .
$B' = \mu_0 \left(\dfrac{n}{2}\right)(3I) = \dfrac{3}{2}B$ .
So the answer is (c) $\dfrac{3}{2}B$ .

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