# lecture19 - Charged Particles in Electric and Magnetic...

This preview shows pages 1–7. Sign up to view the full content.

Charged Particles in Electric Charged Particles in Electric and and Magnetic Fields Magnetic Fields Motion of charged particles Lorentz Force Examples: cyclotron, mass spectrometer

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Recall: In general: “Lorentz Force” E q F = E q B v q F + × = in a magnetic field B v q F × = in an electric field
Magnetic Fields: F F = = q q v v × × B B q x x x x x x x x v v F F + The force is perpendicular to the velocity (and path), so: no work is done by B kinetic energy is constant speed is constant Only the direction of the motion changes due to the magnetic force. B B

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
1) Uniform B B , , v v perpendicular to B B + q v x x x x x x x Motion is a circle . F Magnetic force ( v ) is F m = qvB (constant) But F c = mv 2 /r , so the radius of circle is : mv r qB = r
Example: Example: A proton is moving in a circular orbit of radius 14cm in a uniform magnetic field of 0.35T directed perpendicular to the velocity of the proton. Find the orbital speed of the proton.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2) Uniform B, v not
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 05/02/2010 for the course PHYSICS 1E03 taught by Professor Jopko during the Spring '08 term at McMaster University.

### Page1 / 14

lecture19 - Charged Particles in Electric and Magnetic...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online