JEE Main 2015 · 10 Apr · Shift 1 · Physics Q20

← JEE Main 2015 · 10 Apr · Shift 1

PhysicsSingle correct+4 / -1Question 20 of 90

A 25 cm long solenoid has radius 2 cm and 500 total number of turns. It carries a current of 15 A. If it is equivalent to a magnet of the same size and magnetization $\vec M$ (magnetic moment/volume), then $|\vec M|$ is :

3π Am

^{-1}

30000 Am

^{-1}

300 Am

^{-1}

30000π Am

^{-1}

Answer and worked solution

Official answer: B

$M=nI=\dfrac NLI=\dfrac{500}{0.25}\times15=30000$ A/m.

Topics:Magnetic materials Ampere's circuital law

← Previous question Next question →

JEE Main 2015 · 10 Apr · Shift 1, Physics question 20