A wire loop is formed by joining two semicircular wires of radii `r_1` and `r_2` as shown in the figure if the loop carries a current `I_1` find the magnetic field at the centre O.
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A wire loop of the form shown the figure carries a current. Obtain the magnitude and direction of the magnetic field at P.

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 wire of length L carrying a current I is bent into a circle. The magnitude of the magnetic field at the centre of the circle is

Two circular coils are made of two identical wires of same length and carry same current. If the number of turns of the two coils are 4 and 2, then the ratio of magnetic induction at the centres will be

A long wire carries a steady current . It is bent into a circle of one turn and the magnetic field at the centre of the coil is B . It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil will be

A rectangular loop of sides 10cm and 5cm carrying a current I of 12A is placed in different orienctations as shown in the figure If there is a uniform magnetic field of 0.3 T in the positive z-direction, in which orientations the loop would be in (i) stable equilibrium and (ii) unstable equilibrium .

A conductor has 3 segments two straight and of length L each and a semicircular with radius R. It carries a current I. What is the magnetic field B at point P

the given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance R_1 will be

A circular loop of radius 9.7 cm carries a current 2.3A. Obtain the magnitude of the magnetic field:- centre of the loop .