Equal currents passing through two infinitely long parallel wires. Would there be any magnetic field midway between the wires, if the currents are (i) in the same direction, (ii) in opposite directions?

Current I is flowing through a vertical long wire in the upward direction. The magnetic field at a point on the east of the wire is

Two infinitely long conductors are placed at a separation r and each carrying a current i. What is the magnetic field at a point midway between the conductors when the currents are in opposite directions?

The radius of each of two circular coils of single turn is r. The two coils are placed parallel to each other with a common axis. The distance between their centres is (r)/(2) . If equal current is sent through the two coils in the same direction, what will be the magnetic field (i) at the centre of each coil and (ii) at the mid point on the line joining the centres of the coils? What is the ratio of these two magnetic fields?

5 A current is flowing through a long straight conducting wire. What is the magnitude of magnetic field at a distance 10 cm from the wire ?

10 A current is passing through each of two long straight parallel wires. What should be the distance between the two wires (in cm) so that 0.4 dyn force acts per cm length of each wire? [mu_(0)=4pixx10^(-7)H.m^(-1)]

If the force between the two parallel wires having carrying current, is F, then what will be the force if the current is doubled?

State the rule for the determination of the direction of magnetic field in the vicinity of a current carrying wire.

A long straight wire is carrying a current. An electron starts its motion on a line parallel to the wire in a direction same as that of the current. What will be the direction of the force on the electron?