As shown in figure a cell is connected across two points A and B of a uniform circular conductor of radius r. Prove that the magnetic field induction at its centre O will be zero.

A cell is connected across two points P and Q of a uniform circular conductor, figure. Prove that the magnetic field at its centre O will be zero.

In figure what is the magnetic field induction at point ‘O’?

The magnetic induction at the centre O in the figure shown in

A current I is flowing in a conductor shaped as shown in figure. The radius of the curved part is r and length of straight portion is very large. Find the magnetic field induction at the centre O.

A current I is flowing in a conductor shaped as shown in figure. The radius of the curved part is r and length of straight portion is very large. Find the magnetic field induction at the centre O.

A cell is connected between two points of a uniformly thick circular conductor. The magnetic field at the centre of the loop will be (Here i_(1) and i_(2) are the currents flowing in the two parts of the circular conductor of radius 'a' and mu_(0) has the usual meaning)