Find the magentic inducrtion at the centre of a recentagular wire frame whose diagonal is equal to `varphi = 30^(@)`, the current flowing in the frame equlas `I = 5.0 A`.

Find the magnetic induction at the centre of a rectangular frame of wire whose diagonal is equal to d=16 cm and the angle between the diagonals is equal to phi=30^(@) , the current flowing in the frame equal to I=5.0A .

Find the coordinates of centre of mass of a uniform semicircular closed wire frame with respect to the origin which is at its centre. Radius of the circular portion is R

In the frame work of wires shown in figure, a current I ampere is flowing. Find the magnetic field at O.

Find the magnetic induction of the field at the point O at a loop with current I , whose shape is illustrated in figure (a)In figure a the radii a and b , as well as the angle varphi are known (b)In figure b ,the raidus a and the side b are known. (c)A current I=5.0 A flows along a thin wire shaped as shown in figure.The radius of a curved part of the wire is equal to R=120 mm ,the angle 2varphi=90^(@) .Find the magnetic induction of the field at the point O .

A direct current of density j flows along a round unifrom staright wire with cross-section radius R . Find the magnectic induction vector of this current at the point whose position relative to the axis of the wire is defined by a radius vector r . The magentic permeabilility is assumed to be equla to unity thoughhout all the space.

A current I = 5.0 A A flows along a thin wire shaped as shwon in Fig. The radius of a curved part of the wire is equal to R = 120 mm , the angle 2varphi = 90^(@) . Find the magentic induction of the field at the point O .

A rectangular wire frame of dimensions (0.25 xx 2.0 m) and mass 0.5 kg falls from a height 5m above a region occupied by uniform magnetic field of magnetic induction 1 T. The resistance of the wire frame is 1/8 (Omega) . Find time taken by the wire frame when it just starts coming out of the magnetic field.