Two parallel wires carrying currents in the same direction attract each other because of:

Two parallel wires carryiing current in the same direction attract each other, while two beams of electrons travelling in the same diection repel each other. WHy? Give reasons.

Prove that the parallel conductors of infinite length, carry current in the same direction, attravt each other. Deduce the expressions for the force per unit length experienced by each conductor.

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.