# The coil in a generator has 100 windings and a crosssectional area of (0.0100 mathrm{~m}^{2}). (a) If

## Question:

The coil in a generator has 100 windings and a crosssectional area of \(0.0100 \mathrm{~m}^{2}\).

**(a)** If the coil turns at a constant rotational speed and the magnetic field in the generator is that of Earth \(\left(B=0.500 \times 10^{-4} \mathrm{~T}\right)\), how many \(360^{\circ}\) rotations must the coil complete each second to generate a maximum induced emf of \(1.00 \mathrm{~V}\) ?

**(b)** Based on this calculation, does it seem practical to use Earth's magnetic field in electric generators?

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