Student Login

Home›Chapters›Moving Charges and Magnetism PYQs›Ampere's Law, Cylinders, Solenoid & Toroid›Question 21

MHT CET 2024 (9 May, Shift 2) · Ampere's Law, Cylinders, Solenoid & Toroid

Ampere's Law, Cylinders, Solenoid & Toroid question from MHT CET 2024 (9 May, Shift 2)

Q21MHT CET 2024 · 9 MAY · SHIFT 2Easy

Ampere's Law, Cylinders, Solenoid & Toroid

A long solenoid carrying a current produces magnetic field B along its axis. If the number of turns per cm are tripled and the current is made $\left(\frac{1}{4}\right)$ th then the new value of magnetic field will be

Show answer and solution

Answer: (c)

$B = \mu_0 n I \propto nI$ .
$B' = \mu_0 (3n)\left(\dfrac{I}{4}\right) = \dfrac{3}{4}B$ .
So the answer is (c) $\dfrac{3B}{4}$ .

Report a mistake

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

The magnetic induction due to an ideal solenoid is independent ofMHT CET 2024 (9 May, Shift 1)
The magnetic field intensity inside current carrying solenoid is H = 2.4 × 10³ A/m. If…MHT CET 2024 (9 May, Shift 1)
A solenoid of length 0.5 m has a radius of 1 cm and is made up of ' m ' number of turns…JEE Main 2024 (5 Apr, Shift 2)
The magnetic induction along the axis of a toroidal solenoid is independent ofMHT CET 2024 (16 May, Shift 1)
A current of 5 A flows through a toroid having a core of mean radius 20 cm. If 4000 turns…MHT CET 2024 (3 May, Shift 1)
A long straight wire of circular cross-section (radius a) is carrying steady current I…JEE Main 2023 (6 Apr, Shift 1)
A long solenoid is formed by winding 70 turns cm ⁻¹. If 2.0 A current flows, then the…JEE Main 2023 (24 Jan, Shift 2)
A rod with circular cross-section area 2 cm² and length 40 cm is wound uniformly with 400…JEE Main 2023 (31 Jan, Shift 1)