Start Free Mock LoginAlready registered? Login here

Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic torque & energyEasy2 minQB

PhysicsEasysingle choice

A circular coil having $N$ turns and radius $r$ carries a current $I .$ It is held in the $X Z$ plane in a magnetic field $B \hat{i}$ . The torque on the coil due to the magnetic field is:

Options:

Answer:

Solution:

solution

Magnetic moment $(\vec{M}) = N I (π r^{2}) \hat{j}$
Torque $(\vec{τ}) = \vec{M} \times \vec{B}$
$= (N I (π r^{2}) \hat{j}) \times (B \hat{i})$
$= B N I π r^{2} (- \hat{k}) N m$
$|\vec{τ}| = B N I π r^{2} N m$

Stream:JEESubject:PhysicsTopic:MagnetismSubtopic:Magnetic torque & energy

⏱ 2mℹ️ Source: QB

Doubts & Discussion

Loading discussions...