Consider the following figure. The ends of the loop that go off the page connect

Question

Consider the following figure. The ends of the loop that go off the page connect to a freely rotating pivot point on a generator, which allows the loops to spin.

a) Look at the magnetic force at the bottom part of the wire loop. Does this magnetic force exert a torque on the bottom part of the loop? Explain.

b) Consider the magnetic force on the left part of the loop. Which way does the magnetic torque on this part of the wire point?

c) Now consider the magnetic force on the right part of the loop. Which way does the magnetic torque on this part of the wire point?

d) Use your answers from parts b) and c) to deduce whether or not the loop feels a net torque from the magnetic field.

Explanation / Answer

Force acting on the loop F= i(lxB), where l= lenth of the wire at any instant, B= Magnetic field strength.

Now torque T = rxF

i.e Torque acts perpendiculat to both length and force.

(a) At the bottom of the wire, Yes, the magnetic force exerts torque on the loop. By using Fleming's Left hand rule, the force acts towards Up (i.e towards centre of the loop).

(b) At the left of the loop, according to left hand rule, the magetic force force acts towards right and centre of the loop. Since Torque is peroendicular to length and force, it acts towards "out of the poage"

(c) At the right of the loop, according to left hand rule, the magetic force force acts towards left and centre of the loop. Since Torque is peroendicular to length and force, it acts towards "into the page"

(D) The torque in b and c, it exactly equal and opposite. So the resultant torque is Zero.

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