Consider the magnetic field produced by a finitely long current carrying wire .

Options

A. the lines of field will be concentric circles with centre on the wire.
B. There can be two points in the same plane where magnitude of magnetic field is same.
C. There can be large number of points where magnitude of the magnetic field is same.
D. The magnetic field at a point is inversely proportional to the distance of the point from the wire.

Answer

A, B, C

Explanation

`B=(mu_(0)i)/(4pid)[sin alpha+sinbeta]`
B is not inversely proportional to d as `sin alpha` and `sin beta` depend an d.