Derive an expression of Force between two infinitely long parallel current carrying conductors.

Derive an expression for the force between twolong parallel conductors carrying current in the same direction.What type of force is acting between two long parallel conductors carrying current in the same direction ? Using the expression define S.l. unit of current.

Using Ampere.s circuital law derive an expression for magnetic field due to infinitely long current carrying wire at a point at distance Yfrom it.

Write the expression for the magnitude of force per unit length between two infinitely long parallel straight conductors.

Derive an expression for the magnetic field.at the centre of a current carrying coil.