if a current I flowing through a infinitely long straight wire , the magnetic field at a distance of a is
`mu `0 ` I//` 2a
`mu `0 ` I//` `pi` a
`mu `0 ` I//`2 `pi`

A long straight wire is carrying a current of 12 A . The magnetic field at a distance of 8 cm is (mu_(0) =4pi xx 10^(-7) N A ^(2))

The magnetic field at a distance r from a long wire carryimg current I is 0.4 T. The magnetic field at a distance 2r is

A current of I amperes is flowing through each of the bent wires as shown. Find the magnitude of magnetic field at O.

A current of 2 amp. flows in a long, straight wire of radius 2 mm . The intensity of magnetic field on the axis of the wire is

Equal currents are flowing in three infinitely long wires along positive x,y and z -directions. The magnetic field at a point (0,0-a) would be ( i= current in each wire)

Same current i is flowing in the three infinitely long wires along positive x-,y- and z-directions. The magnetic filed at a point (0,0,-a) would be

Current I_1 and I_2 flow in the wires shown in Fig. The field is zero at distance x to the right of O. Then

In the diagram shown, I_(1), I_(2) are the magnitudes of current in the squre loop and infinite long straight conductor respectively. If the net magnetic field at the centre of the loop is zero, then the relation between I_(1) and I_(2) is

A current 'I' flows along an infinitely long straight conductor. If 'r' is the perpendicular distance of a point from the lower end of the conductor, then the magnetic induction B is given by

In figure two infinitely long current carrying wires are shown . If resultant magnetic field at point A is zero. Then determine current I_(1) .