The magnitude of the magnetic field inside a long solenoid is increased by (a) decreasing its radius (b) decreasing the current through it (c) increasing the area of cross-section (d) introducing a medium of higher permeability

Answer: (d). Inside a long solenoid B = μ n I = μ₀ μr n I. B does not depend on radius or area, and decreasing I lowers B. A medium of higher permeability μ increases B. So the answer is (d).

The magnitude of the magnetic field inside a long solenoid is… | MHT CET 2026 (15 May, Shift 2)

Q5MHT CET 2026 · 15 MAY · SHIFT 2Easy

Ampere's Law, Cylinders, Solenoid & Toroid

The magnitude of the magnetic field inside a long solenoid is increased by

Show answer and solution

Answer: (d)

Inside a long solenoid $B = \mu n I = \mu_0 \mu_r n I$ .
$B$ does not depend on radius or area, and decreasing $I$ lowers $B$ .
A medium of higher permeability $\mu$ increases $B$ .
So the answer is (d).

Report a mistake

More questions on Ampere's Law, Cylinders, Solenoid & Toroid

The magnitude of the magnetic field inside a long solenoid is increased byMHT CET 2026 (13 May, Shift 2)
Choose the WRONG Statement from the following statements. (A) A toroid is a solenoid bent…MHT CET 2026 (12 May, Shift 2)
A solenoid of 1000 turns is wound uniformly on a glass tube 4 m long and 0.3 m in…MHT CET 2026 (20 Apr, Shift 2)
A long solenoid carrying a current produces a magnetic field ' B ' along its axis. If the…MHT CET 2026 (20 Apr, Shift 1)
The magnetic induction produced inside an ideal solenoid, depends on which of the…MHT CET 2026 (19 Apr, Shift 2)
The magnetic field intensity (H) at the centre of a long solenoid having 'n' turns per…MHT CET 2026 (16 Apr, Shift 2)
A long straight wire of a circular cross-section with radius ' a ' carries a steady…JEE Main 2025 (24 Jan, Shift 2)
The magnetic field intensity H at the centre of a long solenoid having n turns per unit…MHT CET 2025 (25 Apr, Shift 1)

Ampere's Law, Cylinders, Solenoid & Toroid question from MHT CET 2026 (15 May, Shift 2)

More questions on Ampere's Law, Cylinders, Solenoid & Toroid