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Wire coil in decreasing magnetic field

  1. Feb 26, 2015 #1
    1. The problem statement, all variables and given/known data
    A wire coil of 2 cm with 10 turns is in a magnetic field of 2 T. The field is perpendicular to the plane of each turn of the coil. The coil is wired in series with resistor of 5 Ω. The field drops at a constant rate to 0.0 T in 10 ms. What is the current through the resistor?

    2. Relevant equations
    V=IR
    Possibly F=ILxB ?
    Magnetic Flux= B⋅dA = Bπr2

    3. The attempt at a solution
    I=V/R

    We know that the magnetic field drops from 2T to 0T in .01 seconds, or -200T/s

    and the Resistor is 5 Ω

    Flux= B⋅dA = Bπ(.02)2

    I'm assuming I'm missing a link to these things in my head any help would be appreciated
     
  2. jcsd
  3. Feb 26, 2015 #2

    TSny

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    Gold Member

    Can you bring in Faraday's law of induction?
     
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