Write expression for the force between two short parallel wires carrying a current, when they are much separate?

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.

Write general expression for force between two point charges.

Is a wire carrying current charged?

Write an expression for the centripetal force.

Find the magnitude and direction of the force between two parallel conducting wires carrying current and hence define ampere.