Formulas for electricity.

#### Force on a moving charge in a magnetic field

- Given by:

\begin{align} F = qvb\sin{\theta} \end{align}

- Note that $\theta$ is the angle between the particle's direction of movement and the
**magnetic field lines**. - Direction of the force is given by the
**Right hand palm rule**, where I is given by the direction of the particle- Note that, if it is an
**electron**, the thumb points in the**opposite**direction.

- Note that, if it is an
- Be aware of the following:

#### Electric fields

- Electric field strength is given by

\begin{align} E_f =\frac{V}{d} \end{align}

- Note that it is
**the same between the metal plates**, no matter the position in between them. - Do not get this confused with Energy, which is why it's written as $E_f$ here instead.
- The force on a charged particle in this field is given by:

\begin{equation} F = q E_f \end{equation}

- Note that the direction of this force is given by the
**charge of the particle.**- A negative charge would move towards the positive and away from the negative.
- A positive charge would move towards the negative and away from the positive.

page revision: 0, last edited: 01 Nov 2011 10:56