1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Current produced by varying magnetic flux

  1. Jun 29, 2011 #1
    I'm translating the problem, so sorry for the errors.

    1. The problem statement, all variables and given/known data
    Radius of the upper circumference = 5cm
    Radius of the lower circumference = 9cm
    Resistance/meter = 3.00 ohm/meter
    B is the magnetic field: DB/dt = 2.00 T/s

    What's the magnitude of the current, and where does the current points to?

    2. Relevant equations

    EMF = [itex]-N \ \frac{\Delta \Phi_B}{\Delta t} \ \ \mbox{or} \ \ -N \ \frac{d\Phi_B }{dt}[/itex]
    V = RI

    3. The attempt at a solution
     

    Attached Files:

    Last edited: Jun 29, 2011
  2. jcsd
  3. Jun 29, 2011 #2
    Well, find the magnetic flux from the external field; the current should be produced in order to oppose an change in magnetic flux.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook




Loading...