Suppose an isolated north pole is kept at the centre of a circular loop carrying a electric current $i$. The magnetic field due to the north pole at a point on the periphery of the wire is $B$. The radius of the loop is $a$. The force on the wire is
Suppose an isolated north pole is kept at the centre of a circular loop carrying a electric current $i$. The magnetic field due to the north pole at a point on the periphery of the wire is $B$. The radius of the loop is $a$. The force on the wire is
- A
Nearly $2 \pi a i B$ perpendicular to the plane of the wire
- B
$2 \pi a i B$ in the plane of the wire
- C
$\pi a i B$ along the axis of the wire
- D
$0$
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