Explain why two long parallel straight conductors carrying current in opposite direction in air repel?

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.

WHat is the direction of force between two parallel conductors carrying current in opposite direction?

WHat is the direction of force between two parallel conductors carrying current in same direction

In the alongside figure a straight conductor B is carrying current in the vertical downward direction. What will be the direction of magnetic field lines around the conductor?

Two wires carry current in different directions. They will: