how many loops in a coil

**rcmango** · February 19th 2008, 06:11 PM

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.

**james_bond** · February 20th 2008, 12:03 AM

We use that: $U_i=N\cdot\frac{\Delta\Phi}{\Delta t}$ .
So $\frac{\Delta\Phi}{\Delta t}=\frac{2.78}{161}$ . Therefore $N_2=\frac{U_2}{\frac{\Delta\Phi}{\Delta t}}=\frac{4.96}{\frac{2.78}{161}}\approx \mathbf{287}$ .

**rcmango** · February 20th 2008, 10:09 AM

Thankyou, now i can see how it should be set up.

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