Two wires both of length are formed into (1) a circle and (2) a square . Each one carries a current i,Show that the magnetic field at the centre produced by the square is greater that that produced by the circle.

A square loop of wire of side a carries a current i . Calculate the magnetic field at the centre of the loop

A wire of length l is bent in the form of an equilateral triangle and carries an electric current i. (a) Find the magnetic field B at the centre. (b) If the wire is bent in the form of a square, what would be the value of B at the centre?

Figure shows a square loop made from a uniform wire. Find the magnetic field at the centre of the square if a battery is connected between the points A and C.

If a thin wire of length 88 cm is bent into a circular loop and a current of 1A is passed, a. What is the magnetic field at the centre? b. What is the magnetic field at the centre if the wire is bent into a semicircle and doubled on it? c. If the wire is looped into two loops, find the magnetic field at the centre.

A current of 2*00 A exists in a square loop of edge 10*0 cm . Find the magnetic field B at the centre of the square loop.

A regular polygon of n sides is formed by bending a wire of total length 2 pi r which carries a current i. (a) Find the magnetic field B at the centre of the polygon. (b) By letting n rarr oo , deduce the expression for the magnetic field at the centre of a circular current.

Calculate the magnetic field at the point p (Refer figure ) due to straight wire XY carrying a current i.

In the diagram shown is ciruclar loop carrying current I. show the direction of the magnetic field with the help of lines of force.

A straight wire of length l can slide on two parallel plastic rails kept in a horizontal plane with a separation d. The coefficient of friction between the wire and the rails is mu . If the wire carries a current I, what minimum magnetic field should exist in the space in order to slide the wire on the rails.

Magnetic field induction at athe cetre O of a square loop of side a carrying current I as shown in figure is