What are the only two forces your body has ever experienced??? GRAVITY ELECTRIC

CHARGED PARTICLES IN ELECTRIC FIELDS

EXAMPLES

LHC Cern circumference = 27 km depth= 100 m

X ray tube

FIELDS In physics, a field is a region where a non contact force acts.

e.g. a gravity field Gravity force Gravity Field Force is in the direction of the field

Electric Fields are created by charged particles (electrons or protons) Force

What shape is the electric field around her head?

Charged wire in oil. Floating threads show the field

Field lines are in the same direction as the force on a positive charge Force

extension Predict the shape of the field around a proton and an electron

extension

FIELD BETWEEN PARALLEL PLATES Predict the shape of the field between a negative and positive plate.

Platipii have electric field sensors in their beaks to detect the electric fields produced by muscles in their prey

Force on a charge in an Electric Field Force on a mass in a Gravity Field is Force on a charge in an Electric Field is

Gravity Field Electric Field mass m charge +q force F h d Energy Changes in Fields

Particle Accelerators Particle Accelerators are designed to accelerate charged particles to very high speeds. Uses range from TVs to huge colliders.

cathode anode filament

Kinetic energy gained by the electron is

LHC Cern circumference = 27 km depth= 100 m

Proton Tube

Particle Detector

Voltage When a charge moves between the plates, it gains or loses electrical potential energy.

Voltage The VOLTAGE is the energy gained (or lost) by a Coulomb of charge

an easier way to measure electric field strength……

excellence question 5000 V 20 mm Calculate the electron’s energy gain.

excellence question for V 20 mm Calculate the electron’s velocity as it passes through the hole.

X ray tube

Calculate the speed of the electrons when they hit the target 10 5 V

Cathode Ray Tubes

With switch open … With switch closed …

The downward force is constant so the path of the electron is a parabola

Cathode Ray Tube