Charge & Field

A2 Unit G495 - Fields and Particles

Chapter 16 - Charge and Field

Title	Description
Task 1a - Starter	It is important that we know the units and definitions for this module. Try these starter questions and see how many you can remember....
Task 1b - Electron deflection tube	Your teacher will show you the electron deflection tube. Complete the analysis of the electrons' path on this worksheet. You will also need a copy of this formula sheet to stick in the back of your book for reference.
Task 2a - uniform electric fields I	Your teacher will show you several demonstrations, including a graphite coated ping-pong ball between two charged plates, a bunsen burner flame between charged plates, and charged water droplets from a syringe. Try answering these questions (Q10W) to demonstrate your understanding.
Task 2b - Uniform electric fields II	Your teacher will explain how a uniform electric field was used to find the charge-to-mass ratio of an electron, using these powerpoint presentations: Milikan's Oil Drop Experiment 1 and Milikan's Oil Drop Experiment 2 Now complete these questions (Q60S) looking at two possible uses of uniform electric fields.

Task 3 - Speed and energy of particles - Newtonian calculations	Charged particles travelling through electric fields gain energy, and hence are accelerated. These calculations (Q10S) look at calculating the velocities of particles accelerated through low voltages.
Task 4 - Speed and energy of particles - Relativistic calculations	Charged particles accelerated through high enough voltages gain large amounts of energy - enough that we must consider relativistic effects in order to calculate their velocities. These calculations (Q20S) require you to calculate the velocities of such particles, using relativistic principles.
Task 5 - Particles energies & deflection by uniform electric fields - starter questions	These starter questions check you can calculate the speed and energy of particles, and the deflection of a moving particle in a magnetic field. Click the image below to download these questions.
Deflection with electric fields	Try these exam questions: Jan 2003 Q11 (Section B, 15 marks) Jan 2004 Q11 (Section B, 10 marks)
Deflection with electric and magnetic fields	Try these exam questions: Jan 2005 Q8 (Section B, 12 marks)
non uniform fields	Demos with charged rods, spheres van de graaf generator etc.

Rutherford Scattering	link in Q70S and Q80S.
Rutherford scattering II	Try these exam questions: * Jan 2001 Q7
exam questions - non uniform fields	• Jan 2001 Q12 June 2001 Q5