Derive an expression for the force acting per unit length of the wire in case of two long parallel wires carrying currents.

Derive an expression for:- Kinetic energy per unit mass

Derive an expression for strain energy per unit volume of the material of a wire.

When a force is applied along the length of the wire

Derive an expression for strain energy of the material of wire.

State the expression for force acting per unit length of each of the straight wire conducting current. Hence define SI unit of electric current.

Derive an expression for force acting on current carrying conductor in uniform magnetic field

Derive an expression for the magnetic field due to an infinitely long straight wire carrying current I.

Two free paralell wires carrying currents in opposite direction

Derive an expression for the magnetic field produced by a current flowing through a circular arc of the wire.

State the expression for the magnetic field at the centre of a full circle of a wire carrying a current I.