Figure shows a cylinderical wire diameter a, carrying a current I. The current density which is in the direction of the central axis of the wire varies linearly with radias distance V from the axis according to the relation `J = J_0r//a`. Obtain the magnetic field B inside the wire at a distance r' from its centre.

A wire of length l, carrying current i, is bent in circle of radius r, then magnetic moment at centre of loop is

The magnetic field at a distance r from a long wire carrying current is 0.6 tesla. The magnetic field at a distance 2r is

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 circular coil of radius R carries a current i . The magnetic field at its centre is B . The distance from the centre on the axis of the coil where the magnetic field will be B//8 is

A wire carrying current I and other carrying 2I in the sam direction produce a magnetic field B at the midpoint. What will be the field when 2I wire is swiched off?

A very long straight wire carries a current 5.2A. What is the magnitude of the magnetic field at a distance 3.1 cm from the wire?

Choose the correct option:- The magnetic field at a distance 'r' from long wire carrying a current is 0.8T. The magnetic field a distance 2r is

The magnetic field on the axis of a circular current carrying conductor of radius r at a distance r from centre is B_(a) and the magnetic field at its centre is B_(c ) . The value of B_(a) : B_(c ) is

A wire loop of the form shown the figure carries a current. Obtain the magnitude and direction of the magnetic field at P.

Two long parallel wires going into the plane of the paper are separated by a distance R and carry a current I each in the same direction. Show that the magnitude of the magnetic field at a point P equidistance from the wires and subtending angle theta from the plane containing the wires is B=(mu_0)/pi I/R sin2theta What is the direction of the magnetic field?