A square loop PQRS carrying a current of 6.0 A is placed near long wire carrying 10 A as shown in figure (35-E10). A Show that the magnetic force acting on the part PQ is equal and opposite to that on the part RS. B Find the magnetic force on the square loop.

Question

Philoid · Accepted Answer

Here, current in the wire is

Current in the loop,

Force on an element dx in the arm PQ a distance x away is

similarly, force on RS is,

Hence,.

B distance of PS from wire,

distance of PS from RQ,

Force on element PS is

towards right

Now distance of RQ from wire,

distance of RQ from PS,

similarly, force on RQ is

towards left

Net force,