Theory

FEvBB

### Biot-Savart Law

Helps you asses the magnetic field intensity created by a moving charge.

### Ampere’s Force Law

The force acting on a current carrying conductor in a magnetic force is called Ampere’s force

### Electromagnetic Induction

• The phenomenon of electromagnetic induction states that an induced current appears in a closed conducting loop when the magnetic ﬂux enclosed by the loop is changed.

### Self and Mutual Induction

• The process of variation of current in a circuit leading to induced e.m.f. in the circuit is called Self Induction.

#### Here are some of the problems solved in this tutorial :

Q:

Q: In the ﬁgure shown, a coil of single turn is wound on a sphere of radius r and mass m. The plane of coil is parallel to the inclined plane and lies in the equatorial plane of the sphere. If sphere is in rotational equilibrium, Find the value of B. Let i be the counter-clockwise current through the coil when observed from the top.

Q: Three rings, each having equal radius R, are placed mutually perpendicular to each other and each having it’s center at the origin of the co-ordinate system. If current I ﬂows through each ring, ﬁnd the magnitude of magnetic ﬁeld at the common center i.e, origin.