# Electric and magnetic fields, OCR- Unit 5, module 1

Electric and magnetic fields, OCR- Unit 5, module 1

- Created by: Sameer
- Created on: 13-05-12 18:37

First 368 words of the document:

Physics Unit 5, module 1

Sameer Jahabarali Physics

Electric fields are created electric charges, in which the field strengths represent the

force experienced per unit positive charge. Electric field lines represent:

Direction of force, through the arrows represented (positive repels if a

charge which is relatively more negative, which will is attract)

Strength, which is represented by the gap between each field lines, where

closer the lines stronger the force

There are two types of electric fields:

Uniform fields; occur between charged parallel plates. Charged plates can be

created in a circuit, where E V. As the distance

between the charge plates increase, the strength of

the electric field decreases, hence E 1/d. joining

these two proportionalities together we get the

formula for uniform electric field strength.

Radial fields, occur in a point charges. Similar to

gravitational field strength, E 1/r2. Furthermore, E Q and one final factor that affect

E is the medium (e.g. medium can have and vary charge, like water) knowing this E

1/. Joining all these probabilities gives us the formula of radial electric field strength.

The force these electric fields exert on another charged particle is given by

multiplying the electric field strength by the charge of the new particle or plate.

This is because F=EQ (derived from E=F/Q). Coulomb's law is the Force experience

between two point charges (radial electric force).

In a uniform electric field, the motion of a charged particle will:

Gravitational fields Electric Fields

Attractive force only Attractive and repulsive

E 1/r2 E 1/r2

mass induces a Charge induces a force

force

Vector vector

Accelerate vertically in direction of force acting on the particle (i.e. if particle is positive accelerate

towards the negative and vice versa). The acceleration is the force in a uniform electric field (where Q

is the particle), divided by mass (F=MA)

Travel at a constant horizontal velocity. The velocity is to be calculated before or given.

The similarites and difference between gravitational and electric fields.

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