Magnetic Force between two parallel current carrying conductor

Derive an expression for the force between two long parallel current carrying conductors. Use this expression to define SI unit of current.

Define SI unit of current in terms of the force between two parallel current carrying conductors. (b) Two long straight parallel conductors carrying steady currents I_(a)andI_(b) along the same direction are separated by a distance d. How does one explain the force of attraction between them ? If a third conductor carrying a current I_(c) in the opposite direction is placed just in the middle of these conductors , find the resultant force acting on the third conductor.

The graph of force per unit legth between two long parallel current carrying conductors and the reciprocal of the distance between them is

The force exerting between the two parallel current carrying conductors if F. If the current in each conductor is doubled, what is the value of force acting between them?

The force per unit length between two parallel long current carrying conductor is F. If the current in each conductor is tripled, what would be the value of the force per unit length between them?

Force Between Parallel Current Carrying Wire

Magnetic force between two current carrying wires

The magnetic field midway between two parallel current carrying wires, carrying currents I and 2i in same direction is B. If the current in the wire with current I is switched off, the magnetic field will become