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


Important Questions on Magnetic Effect of Electric Current
If the current flowing in is . Then the field at as shown in the figure will be

A coil of radius is to produce a field of in its centre with a current of . How many turns must be there in the coil?

A current ampere flows in a circular arc of wire whose radius is , which subtends an angle radian at its centre. The magnetic induction at the centre is

A closely wound flat circular coil of turns of wire has diameter of and carries a current of ampere. Determine the flux density at the centre of a coil.

and are two concentric circular conductors of centre and carrying currents and as shown in the figure. If ratio of their radii is and ratio of the flux densities at due to and is then the value of is

Two identical coils carrying equal current have a common centre and their planes are at right angles to each other. What is the ratio of magnitudes of the resultant magnetic field and the field due to one coil along its axis?

The ratio of the magnetic field at the centre of a current carrying circular wire and the magnetic field at the centre of a semi-circular coil made from the same length of wire will be

Two infinite length wires carry currents $8 \mathrm{A}$ and and are placed along $X$ -axis and Y-axis respectively. Magnetic field at a point $\mathrm{P}(0,0, \mathrm{d}) \mathrm{m}$ will be
