Exam II Questions

OlderDan

I thought you had already resolved this one (#24). For this one you only used one side of the loop when you should have used both sides. Both sides contribute to the torque, so only half the current you calculated is needed.

Alt+F4

silly me, thanks alot for your help like seriously. My TA's arent even that helpful

Alt+F4

hmm all right so i graphed this, Does it matter if calc is in radian or degree?

Alt+F4

http://online.physics.uiuc.edu/cgi/c...ice/exam2/su06

Question 20
Finger Curl with current
B Field points Down

I woulda picked Rotates it so that the right side comes out of the page and the left goes in.

Alt+F4

All right last question untill Nov 23rd i think

http://online.physics.uiuc.edu/cgi/c...ice/exam2/fa03

Question 21


So W = 2piF = (2*3.14*580*10^3) = 3.6E6
>and 1 / ( sqrt 1*10^-3 * .06*10^-6) = 1.2909 E5

what am i doing wrong

OlderDan

You are supposed to be finding the value of C that will make the resonant frequency of the circuit the desired broadcast frequency. How does C affect the net capacitance of the circuit?

OlderDan

Currents parallel to magnetic fields experience no force. Currents at right angles do.

OlderDan

Yes. Always use radians for these time dependent problems. If they ask for phase in degrees, convert it from radians. If they give phase in degrees, convert it to radians. Angular frequency is always in radians/sec.

Alt+F4

all right but for some reason when i graph in Radian mode i seriously get like -6 and -5 values unless i am doing something wrong with it

Alt+F4

All right i need a CLarifcation on this one
http://online.physics.uiuc.edu/cgi/c...ice/exam2/sp06

Question 21


The angle i pick should be what to the field line? i wanted to do 90-22.5 but that wont work. Thanks alot

Alt+F4

Last Problem then im off to exam, Thanks Olderdan and whoever else that helped me. Really appreciate it

http://online.physics.uiuc.edu/cgi/c...ice/exam2/fa05


Question 8

OlderDan

Rotate through the small angle from the direction of v to the direction of B. It is just 22.5

OlderDan

Flux is
Φ = BAcosθ where θ is the angle between the loop normal and B. θ = 30 degrees

The only thing changing is B, so

dΦ/dt = (Acosθ)dB/dt

Alt+F4

Can't you take the exam for me?

OlderDan

What exam are you taking? Could I bring all my reference materials with me? I still remember how to do this stuff, but it sure is nice having the references readily available when you don't remember the exact formulas, values of constants, etc.

Alt+F4

nope no refrence but u could program ur calculator. Im takin physics exam in like 2 hrs.