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: Induced EMF in a coil problem

  1. Apr 7, 2010 #1
    1. A 100-turn, 2.0-cm-diameter coil is at rest in a horizontal plane. A uniform magnetic field 60 degrees away from vertical increases from 0.50 T to 1.50 T in 0.60 s.



    2. EMF = N*d(phi)/dt
    phi = flux = ABcos(theta)




    3. dB/dt = 1/0.6
    EMF = 1000*(1/0.6)*pi*r2*0.5 = 0.262 V

    Is that correct? Should the sign be negative?
     
  2. jcsd
  3. Apr 8, 2010 #2

    ideasrule

    User Avatar
    Homework Helper

    Is there a reason you're using 1000 turns when the question says 100?

    Otherwise, the numerical value is correct. By convention, it should be negative.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook