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: Maximum emg induced in coil

  1. Nov 18, 2013 #1
    1. The problem statement, all variables and given/known data

    A 104-turn coil rotates 7.14 times per second. The coil has a cross-sectional area of 0.670 m2 and the
    magnetic field through the coils is 0.0720 T. What is the maximum emf induced in the coil?

    2. Relevant equations

    Honestly the rotating coil is throwing me off. But I think I should use Emax= NBAw

    3. The attempt at a solution
    Emax= NBAw
    =104*.072 T * .67 m2 * 7.14 = 35.82

    But I think that is wrong!

    Thanks, Any direction is appreciated!
    Last edited: Nov 19, 2013
  2. jcsd
  3. Nov 19, 2013 #2
    The rotating coil causes the area that the magnetic field cuts through to change. In the ΔBA term only A changes. B stays the same. This means that the induced voltage will change from a minimum to a maximum and back as the coil rotates in the field. So you need to evaluate the ΔA/Δt term. that is by how much do the area change in what amount of time.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted