Student Login

Home›Chapters›Moving Charges and Magnetism PYQs›Ampere's Law, Cylinders, Solenoid & Toroid›Question 34

JEE Main 2022 (25 Jun, Shift 2) · Ampere's Law, Cylinders, Solenoid & Toroid

Ampere's Law, Cylinders, Solenoid & Toroid question from JEE Main 2022 (25 Jun, Shift 2)

Q34JEE Main 2022 · 25 JUN · SHIFT 2Easy

Ampere's Law, Cylinders, Solenoid & Toroid

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of magnetic field will be equal to

Show answer and solution

Answer: (a)

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

Report a mistake

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

Two wires carrying currents 5 A and 2 A are enclosed in a circular loop as shown in the…MHT CET 2021 (20 Sep, Shift 2)
A thick current carrying cable of radius 'R' carries current 'I' uniformly distributed…NEET 2021
A long solenoid carrying current I₁ produces magnetic field B₁ along its axis. If the…MHT CET 2021 (23 Sep, Shift 2)
A long solenoid carrying a current produces a magnetic field B along its axis. If the…MHT CET 2021 (21 Sep, Shift 1)
The magnetic field intensity 'H' at the centre of a long solenoid having 'n' turns per…MHT CET 2021 (20 Sep, Shift 1)
A solenoid of 1000 turns per metre has a core with relative permeability 500. Insulated…JEE Main 2021 (17 Mar, Shift 1)
Figures A and B show two long straight wires of circular cross-section (a and b with a <…JEE Main 2021 (27 Jul, Shift 2)
A solenoid 2 m long and 4 cm in diameter has 4 layers of windings of 1000 turns each and…MHT CET 2021 (24 Sep, Shift 2)