A short straight conductor carries current I. Write the expression for magnetic field due to this conductor

A long straight conductor carries 35 ampere. Find the magnetic field produced due to this conduc tor at a point 20 cm away from the centre of the wire.

A coil carrying electric current is placed in uniform magnetic field.

If the conductor carrying current is lying parallel to the magnetic field what will be the force?

A straight wire of length 0.5 metre and carrying a current of 1.2 ampere is placed in uniform magnetic field of induction 2 tesla. The magnetic field is perpendicular to the length of the wire. Find the force on the wire is