# Moving Charges and Magnetism

Concept of magnetic field, Oersted's experiment. Biot - Savart law and its application to current carrying circular loop. Ampere's law and its applications to infinitely long straight wire. Straight and toroidal solenoids (only qualitative treatment), force on a moving charge in uniform magnetic and electric fields, Cyclotron. Force on a current-carrying conductor in a uniform magnetic field, force between two parallel current-carrying conductors-definition of ampere, torque experienced by a current loop in uniform magnetic field; moving coil galvanometer-its current sensitivity and conversion to ammeter and voltmeter.

### Ampere’s Law

The line integral for a closed curve is equal to times the net current I threading through the area bounded by the curve. Proof:

### Oersted’s experiment

Take a magnetic needle NS, which can rotate freely about a vertical axis in a horizontal plane. Hold a conducting wire AB over the...

### Magnetic Field

If the charge q is projected from point P in the direction of the current, it is deflected towards the wire (q is assumed...