University:
The University Of Western Ontario
Course:
2223B | Organic Chemistry of Biological Molecules
Academic year:

2023
Views:

454

Pages:

1
Author:

Cole M.

Magnetism Using the Right Hand Rule: Once charges start to move, they begin to experience the force of the magnetic field (which is not in the same direction as that of the magnetic field) Right hand rule: velocity is in the thumb, field is in the direction of the fingers, and magnetic force is coming out of the palm Magnetism - Part 1: A magnet always has a North and South Pole EVEN if you cut the magnet in half (conventionally called this way because it oriented itself towards geographic north) So technically, the south pole is what the north is pointing towards The magnetic field lines go from the north pole to the south pole A key difference between magnetism and electrostatics → for magnets there is always a dipole while in electrostatics there doesn’t have to be this duality - Magnetism - Part 2: The pointer of a compass needle is tangential to that of the field lines (so the compass’s north pole is facing the south pole) Magnetic field is simply the electrostatic field in motion The force acting on a moving charge is: 𝐹 = 𝑄(𝑣𝑥𝐵)→ if parallel, then the value is 0 (this is why you use 𝐹 = 𝑄|𝑣||𝐵|𝑠𝑖𝑛𝜃) B is in units of Ns/Cm or 1 Tesla (T) Remember, v goes in thumb and field is the fingers Magnetism - Part 3: If your units for magnetic field force are in C, T, and C, you’ll get newtons are your final units Magnetism - Part 4: FC = mv2/r ← centripetal force and can be used in order to find the radius of a circle that a magnetic force makes the proton go through a uniform magnetic field Remember, for an electron the magnetic force is in the opposite direction of that of a proton (could technically use the left hand rule) Also, the radius would likely be smaller because the mass of an electron is smaller than that of a proton Extra Notes: Alpha particles is basically the nucleus of a He atom (2 protons and 2 neutrons) → doesn’t do very much damage because its big and can’t penetrate things like the skin very well Beta particles are just electrons and positrons (which also emit an electron antineutrino) Diamagnetic materials create an induced magnetic field in a direction opposite to an externally applied magnetic field due to paired electrons (don’t really generate a magnetic field) Paramagnetic materials are those that create an induced field in the same direction as the external field due to unpaired electrons