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Emf of coil outside a solenoid

  1. Jul 14, 2007 #1
    1. The problem statement, all variables and given/known data

    A coil of 120 turns and radius of1.8 cm and resistance of 5.3 ohm is placed outside a solenoid. If the current in the solenoid is changed, what current appears in the coil while the solenoid is being changed?

    2. Relevant equations

    emf= -dflux/dt = A*dB/dt


    Bsol= nui

    3. The attempt at a solution

    To solve this problem, first you would need to find the emf induced in the coil by the changing current in the solenoid, and then the current by i=emf/R
    but im confused how to apply this. my questions is;

    1) to use emf= -dflux/dt, does this apply to the area of the solenoid or coil? i thought solenoid, but we are only given information about the coil

    thank you for your help
  2. jcsd
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