A wire has 2 straight and one are as shown in the figure. Determine the direction and magnitude of the field produced at the center O of the semi circle by three sections individually and the total.

An electric current I is flowing through an infinitely long conductor bent into the from as shown in the figure. Find the magnitude and direction of magnetic field at the centre of the semi-circular part of the conductor.

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

A square loop of side 12 cm with its sides parallel to X and Y axes is moved with a velocity of 8cms^-1 in the positive x- direction in an enviornment containing a magnetic field in the positive z- direction. The field is neither uniform in space nor constant in time. it has a gradient of 10^-3Tcm^-1 along the negative x-direction (that is it increases by 10^-3 T cm^-1 as one moves in the negative x-direction) and it is decreasing in time at the rate of 10^-3T s^-1 . Determine the direction and magnitude of the induced current in the loop if its resistance is 4.50 m Omega .

Two rods (one semi-circular and other straight) of same material and of same cross-sectional area are joined as shown in the figure. The points A and B are maintained at different temperature. The ratio of the heat transferred through a cross-section of a semi-circular rod to the heat transferred through a cross section of the straight red in a given time is

Two wires shown in the figure are connected in a series circuit and the same amount of current of 10A passes through both, but in opposite directions seperation between the two wires is 8 mm. The length AB is S = 22 cm. Obtain the direction and magnetic field due to current in wire 2 on the section AB of wire 1. Also obtain the magnetic and direction of the force on wire 1. (mu_0=4pixx10^-7TmA^-1) .

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. .

An arrangement of three parallel straight wires placed perpendicular to plate of paper carrying same currents i along the same direction is shown in figure. Magnitude of force per unit length on the middle wire B is given by

Two very long straight wires are set parallel to each other. Each carries a current I in the same directions and the separation between them is 2r. The intensity of magnetic field at point P as shown in figure is ______