A current- carrying straight wire is kept along the axis of a circular loop carrying a current. The straight wire

Options

A. will exert an ineard force on the circular loop
B. will extra a force on the circular loop parallel to itself
C. will exert a force on the circular loop parallel to itself
D. will not exert any force on the circular loop

Answer

D

Explanation

The direction of the field due to the current carrying straight conductor will be either parallel or antiparallel to the flow of current in the loop, depending upon the direction of current in the wire.

`therefore vecF =I (d vecl xx vecB)`
`=Id//B sin theta =0" "[theta =0^(@)or 180^(@)]`