" Define The unit of current "

Define SI unit of current.

Name and define the SI unit of current.

Name and define the SI unit of current.

Write the expression for force per unit length between two striaght parallel current carrying conductors of infinite length . Hence defin e SI unit of current 'ampere'.

Answer the following: (a)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.

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