An electric current is flowing in a circular wire of radius a. At what distance from the centre on the axis of the circular wire will the magnetic field be 1/8th of its value at the centre?

The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54muT . What will be its value at the centre of the loop ?

2A current is flowing through a circular coil of radius 10 cm, made of insulated wire and having 100 turns. If the conductor is palced parallel to the magnetic field, determine the torque acting on it.(magnetic field=0.2T)

What will be the magnetic field at the centre C o the circular loop?

2A current is flowing through a circular coil of radius 10 cm, made of insulated wire and having 100 turns. If the circular plane of the conductor is kept at right angles to the direction of a magnetic field of 0.2Wb.m^(-2) , determine the force acting on the coil.

An electric current i enters and leaves a uniform circular wire of radius a through diametrically opposite points. A particle carrying a charge q moves along the axis of the circular wire with speed v. What is the magnetic force experienced by the particle when it passes through the centre of the circle ?

A straight wire is used ot form a semi-circular wire of radius 2cm. IF a current I=10A is passing through the wire,then find the magnitude and direction of magnetic induction at the centre of the semicircle.

At the centre of a circular coil carrying current, the magnetic filed is________.

For a long wire in the circular shape the magnetic field at the centre is B. If it is used to make n no. of turns, then what will be the magnetic field at the centre?