If you have a 12-turn coil of diameter 2.54 cm which is rotating at a rate such

Question

If you have a 12-turn coil of diameter 2.54 cm which is rotating at a rate such that the flux is steadily decreasing from the initial flux due to earth's 0.50 G field being at normal incidence through the coils to 0 flux in 2.0 s, what will the induced EMF be in Volts? How does placing an iron rod inside of the coils affect the (maximum) emf induced in the secondary coil? Decrease by a large factor (e.g. orders of magnitude) Decrease by a small factor (e.g. by less than one order of magnitude) Unchanged Increase by a large factor (e.g. orders of magnitude) Increase by a small factor (e.g. by less than one order of magnitude)

Explanation / Answer

3. B = 5 x 10^-5 T

magnetic flux = N B A

= 12 x 5 x 10^-5 x pi x (2.54 x 10^-2 / 2)^2

= 3.04 x 10^-7 Wb

Emf = rate of change of flux

= (3.04 x 10^-7) / 2

= 1.52 x 10^-7 Volts

4. Increase by a large factor

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