Q. 7

Is it possible for a current loop to stay without rotating in a uniform magnetic field? If yes, what should be the orientation of the loop?

Answer :

Yes

Formula used: The net torque of a loop is given by



Where τ is torque


i is current


A is area vector


B is magnetic field


θ is the angle between the area vector and magnetic field


When θ=0,



When θ=180,




If θ is zero or 180° (integral multiple of π) then torque will be zero. So coil will stop its rotation. θ=nπ represents that the magnetic field is in parallel with area vector. So the loop can stay in a uniform magnetic field without rotation.


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