# Sources of Magnetic Fields

### Problems

Problem :

What is the point of maximum magnetic field on the axis of a ring wire?

Problem :

Two rings of radius 1 cm and parallel current I are placed a distance of 2 cm apart, as shown below. What is the magnitude of the magnetic field at the point on their common axis midway between the two rings?

Two rings with a common axis. What is the strength of the field at point P ?

Problem :

A semi-infinite solenoid is a solenoid which starts at a point, and is infinite in length in one direction. What is the strength of the magnetic field on the axis of the solenoid at the end of a semi-infinite solenoid?

Problem :

Two rings, both with radius b , with a common center and the same current I are placed at right angles to each other, as shown below. What is the magnitude and direction of the magnetic field at their center?

Two rings at right angles to each other. What is the field at point P ?

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