Find the force between two straight parallel wires, each of length one metre and cach carrying a current of 100 amperes when separated by a distance of one metre `(given mu_0 = 4pi x 10^-7 N/m)`.

Two straight parallel wires, each 20 cm long are separated by 10 cm. They carry 20 amp and 30 amp of current respectively. Calculate the force between them.

Two straight wires A and B of lengths 10 m cach carrying currents of 4.0 A and 6.0 A in opposite directions lic parallel to each other at a distance of 2 cm. Estimate the force on a 10 cm section of the wire B near its centre.

Two straight parallel wires A and B, cach 20 cm long are separated by 10 cm. They carry 20 A and 30 A current respectively in opposite directions. Calculate the magnetic field (i) the mid point

Two parallel Co-axial Coils of equal radius R and- numbers of turn N carrying equal currents I in same direction.are separated by a distance | R. Show that the magnetic field intensity B on the axis around the mid point between the coils is uniform over a very small distance as compared to R and is given by- B = (4/5)^(3/2) (mu_0IN)/R

Two straight parallel wires A and B, cach 20 cm long are separated by 10 cm. They carry 20 A and 30 A current respectively in opposite directions. Calculate the magnetic field at (ii) the point 5 cm from A and 15 cm from B on the line joining them.