Which factors affect the strength of a magnetic field around a current-carrying

Explanation:

The strength of magnetic field around a current carrying wire is given by :

Where

is magnetic permeability

I is the current flowing in wire

r is radial distance

So, the factors on which the strength of magnetic field around a current carrying wire depend are :

(1) Type of metal of the wire. The magnetic permeability depend on the availability of unpaired electron in metals.

(2) The amount of current. Magnetic field strength depend directly on the current flowing.

(3) The direction of current. When the current is in upward direction, the magnetic field will be in anticlockwise direction.

(4) The distance of wire. There is an inverse relationship between the magnetic field strength and distance.

the bal will not change its velocity.