Moving Charges ...

An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the centre has a magnitude of

A wire carrying current i is shaped as shown. Section AB is a quarter circle of radius r. The magnetic field is directed

Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is

A magnetic field can be produced by

For the magnetic field to be maximum due to a small element of current carrying conductor at a point, the angle between the element and the line joining the element to the given point must be

Gauss is unit of which quantity

On connecting a battery to the two corners of a diagonal of a square conductor frame of side a, the magnitude of the magnetic field at the centre will be

The ratio of the magnetic field at the centre of a current carrying coil of the radius a and at a distance \'a\' from centre of the coil and perpendicular to the axis of coil is

A part of a long wire carrying a current i is bent into a circle of radius r as shown in figure. The net magnetic field at the centre Oof the circular loop is

\"On flowing current in a conducting wire the magnetic field produces around it.\" It is a law of