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

(a) Derive an expression for the force between two long parallel current carrying conductors . (b) Use this expression to define S.I. unit of current . (c) A long straight wire AB carries a current I.A proton P travels with a speed v , parallel to the wire , at a distance d from it in a direction opposite to the current as shown in the figure . What is the force experienced by the proton and what is its direction ?

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

Derive an expression for force between two parallel currents.

Derive an expression for the force acting between two very long parallel current-carrying conductors and hence define the Ampere.