AB is a current carrying conductor in the plane of the paper as shown in figure.. What are the directions of magnetic fields produced by it at point P and Q? Given `r_1>r_2`, where will the strength of the magnetic field be larger?

The direction of magnetic field produced on passing electric current in a conductor is determined by

A uniform but time-varying magnetic field B(t) exists with in a circular region of radius a and is directed in to the plane of the paper as shown in the figure. The magnitude of the induced electric field at the point P at a distance r from the centre of the circular region

state the rule to determine the direction of a magnetic field produced around a straight conductor carrying current,