Two long parallel straight wires X and Y separated by a distance of 5 cm in air carry current of 10 A and 5 A respectively in opposite directions. Calculate the magnetic force and direction of the force on a 20 cm length of the wire Y.

Two straight wires A and B of lenghts 10 m and 12 m carrying currents of 4.0 A and 6.0 A respectivity in opposite directions lie parallel to each other at a distance of 3.0 cm. Estimate the force on a 15cm section of the wire B near its centre.

Two long parallel wire P and W are both perpendicular to the plane of the paper with distance of 5 m between them . If P and W carry current of 2.5 A and 5A respectively in the same direction, then the magnetic field at a point half-way between the wires is

Two long parallel wires are 0.4 m apart in air and carry currents of 5 A and 12 A respectively. Calculate the force on each metre of the wire, fi the currents are in the same direction .

A long straight wire in the horizontal plane carries a current of 50 A in north to south direction. Give the magnitude and direction of B at a point 2.5 m east of the wire.

Two long and parallel straight wires A and B carrying currents of 8.0 A and 5.0 A in the same direction are separated by a distance of 4.0 cm. Estimate the force on a 10 cm section of wire A.