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Math Help - how many loops in a coil

  1. #1
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    how many loops in a coil

    In each of two coils the rate of change of the magnetic flux in a single loop is the same. The emf induced in coil 1, which has 161 loops, is 2.78 V. The emf induced in coil 2 is 4.96 V. How many loops does coil 2 have?

    can someone work this one out please.
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  2. #2
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    We use that: U_i=N\cdot\frac{\Delta\Phi}{\Delta t}.
    So \frac{\Delta\Phi}{\Delta t}=\frac{2.78}{161}. Therefore N_2=\frac{U_2}{\frac{\Delta\Phi}{\Delta t}}=\frac{4.96}{\frac{2.78}{161}}\approx \mathbf{287}.
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  3. #3
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    Thankyou, now i can see how it should be set up.
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