Two long straight parallel conductors carry steady current `I_(1) " and " I_(2)` separated by a distance d. if the currents are flowing it the same direction show how that magnetic field st up in one produces an attractive force on the other . Obtain the expression for this force. Hence define one ampere.

(a) Explain, giving reasons, the basic difference in converting galvanometer into (i) a voltmeter and (ii) an ammeter. (b) Two long straight parallel conductors carrying steady currents I_(1) and I_(2) are separated by a distance 'd'. Explain briefly, with the help of a suitable diagram, how the magnetic field due to one conductor acts on the other. Hence deduce the expression for the force acting between the two conductors. Mention the nature of this force.

Two thin, long, parallel wires, separated by a distance 'd' carry a current of 'i' A in the same direction. They will

Two long straight conductors with current I_(1) and I_(2) are placed along X and Y axes. The equation of locus of points of zero magnetic induction is :

Two long straight parallel conductors 10 cm apart, carry currents of 5A each in the same direction. Then the magnetic induction at a point midway between them is

Two long straight wires, each carrying a current I in opposite directions are separated by a distance R . The magnetic induction at a point mid way between the wire is

Two long straight parallel conductors separated by a distance of 0.5m carry currents of 5A and 8A in the same direction. The force per unit length experienced by each other is

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.

Two long parallel straight conductors carry current i_(1) and i_(2)(i_(1)gti_(2)) . When the currents are in the same directions, the magnetic field at a point midway between the wires is 20muT . If the direction of i_(2) is reversed, the field becomes 50muT . The ratio of the current i_(1)//i_(2) is :

Two long parallel conductors cany currents i_(1) = 3A and i_(2) = 3A both are directed into the plane of paper. The magnitude of resultant magnetic field at point 'P, is

Two long and parallel straight wires A and B are carrying currents of 4A and 7A in the same directions are separated by a distance of 5cm. The force acting on a 8cm section of wire A is