Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Finding loop current

  1. Sep 30, 2008 #1
    1. The problem statement, all variables and given/known data

    A conducting loop with area 0.13m^2 and resistance 5.0 ohms lies in the x-y plane. A spatially uniform magnetic field points in the z direction. The fields varies with time according to B_z_=at^2 - b, what a=2.4 T/s^2 and b=8.2 T

    Find the loop current t=1.5s

    I= A

    2. Relevant equations

    Im looking for I and im given a R so I know I use I=emf/ R
    Im guessing my 1st step is to find "emf" but there lies my problem....how should I go about it?

    3. The attempt at a solution
  2. jcsd
  3. Sep 30, 2008 #2


    User Avatar
    Homework Helper

    Just apply Faraday's law. Now of course the question is how exactly do you apply it? Note that magnetic flux through a conducting loop changes if either the strength or direction of the field varies with time.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook