# Magnetism Formulas

Andre-Marie Ampere is known for the electromagnetism concept that gives the relationship between the electric current and magnetic fields. There are many formulas in magnetism. Some of them are:

**Magnetic force that acts on a charge q is given as,**

F = qvB sin $\theta$.

Where, F is the force,

q is the charge,

v is the velocity,

B is the magnetic field,

$\theta$ is the angle between B and v.

**Force that acts on a wire in a magnetic field is given as,**

F = BIL sin $\theta$.

Where, F is the force,

B is the magnetic field,

I is current flow,

L is length,

$\theta$ is the angle between B and v.

**Torque on a rectangular loop is given as,**

$\tau$ = NBIA sin $\theta$.

Where,

N is the number of turns,

B is a magnetic field,

I is current in amperes,

A is area,

$\theta$ is the angle between B and v.

**Charged particle in a magnetic field is given as,**

r = $\frac{mv}{qB}$.

Where, r is the radius of the path,

m is the mass,

v is the velocity,

q is the charge,

B is the magnetic field.