Q. 2

A current carrying, straight wire is kept along the axis of a circular loop carrying a current. The straight wire.
A. will exert an inward force on the circular loop

B. will exert an outward force on the circular loop

C. will not exert any force on the circular loop.

D. will exert a force on the circular loop parallel to itself.

Answer :

There won’t be any magnetic force acting on the wire in this case because, according the Cork-Screw rule, the magnetic field due to the straight wire will be parallel or anti parallel to the direction of current in the loop, thus creating an angle of 0 or ϖ with the direction of current.


According to F = ILBsinϴ


Where


I is the current,


L is the length of the wire


B is the magnitude of the magnetic field.


for ϴ = 0 or ϖ, F= 0.

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