(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 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.

Magnetic lines of force due to a straight conductor carrying current are

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 thin, parallel conductors carrying equal currents in the same direction are fixed parallel to the x-axis, one passing through y = a and the other through y=-a . The resultant magnetic field due to the two conductors at any point is B. Which of the following are correct?

The two linear parallel conductors carrying currents in the opposite direction…………………each other.

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 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

Explain the term 'drift velocity' of electrons in a conductor. Hence obtain the expression for the current through a conductor in terms of 'drift velocity'.

The potential difference between two conductors is 1 volt'. Explain the meaning of this statement.

Find magnetic field at O due to the current carrying conductor as shown in the figure.