# BR Electricity and Magnetism

#### acetylmandarin

2+ Year Member
Did anyone have trouble with this chapter? I've read it twice now and I am really lost. I have spent two days trying to understand this. I also don't really understand any of the phase I passages except for the Millikan oil drop experiment. Magnetism was never covered in my physics classes, and I'm also not familiar with that section on electronic dipoles and calculating torque for charges? That stuff is completely foreign to me

#### alpha-GTP

##### Where's my 5' UTR?
Magnetism is pretty low yield, so I wouldn't focus on it if you are limited for time to do content review. You may at best get a free response question out of this. With electricity, I would focus on circuit elements and maybe electrostatics. These were not my strength and I learned this stuff 10+ years ago, so I had to do a lot of content review.

#### Horse Apiece

2+ Year Member
Focus on the practice problems.
Get your equations and units down.

Joules, coulombs, volts, resistance, resistivity, watts, etc...

R=(resistivity) Length/cross sectional area
P=IV P=(I^2)R P= (V^2)/R
G= -nFE (still falls under electricity)
V=IR
parallel = same voltage drop (IR=IR) series = same current (I=I)
capacitors in series and parallel. resistors in series and parallel
q=CV
Fe=kQq/r^2 and E = kQ/r^2 so... Fe=qE V=kQ/r qV=Potential energy 0.5mv^2 = Kinetic energy (just general physics but is brought up alot in particles accelerated in a field)
F=qvBsin(theta)

I'm probably missing a few things, but this is most of what you need to know how to apply.

BerkReviewTeach

#### BerkReviewTeach

##### Company Rep & Bad Singer
Vendor
10+ Year Member
Did anyone have trouble with this chapter? I've read it twice now and I am really lost. I have spent two days trying to understand this. I also don't really understand any of the phase I passages except for the Millikan oil drop experiment. Magnetism was never covered in my physics classes, and I'm also not familiar with that section on electronic dipoles and calculating torque for charges? That stuff is completely foreign to me
This is one of the sections where you are at a disadvantage using our old books as opposed to the new ones. While I'm not sure I 100% agree with alpha-GTP that it is low yield, it is certainly not high yield. Your best bet is to focus on the passages that involve electrophoresis, the right-hand-rule, and m/q ratios. The updated book has reduced content and more biological examples here, so I'd recommend emphasizing those subjects when you use the older materials.

OP

#### acetylmandarin

2+ Year Member
This is one of the sections where you are at a disadvantage using our old books as opposed to the new ones. While I'm not sure I 100% agree with alpha-GTP that it is low yield, it is certainly not high yield. Your best bet is to focus on the passages that involve electrophoresis, the right-hand-rule, and m/q ratios. The updated book has reduced content and more biological examples here, so I'd recommend emphasizing those subjects when you use the older materials.
. I'm using the updated book

#### Horse Apiece

2+ Year Member
. I'm using the updated book
BerkTech is saying that's a good thing.