In Lab 9, you will be testing Lenz?s law that you learned in Monday Lecture and

Question

In Lab 9, you will be testing Lenz?s law that you learned in Monday Lecture and applying your knowledge of electromagnetic induction to develop a practical application. In this case you will be building an electric generator using simple equipment. You electric generator must produce variable emf that is strong enough to light up a small LED. You will be given the following equipment: Think of possible designs and most importantly estimate the number of turns in a coil of wire of a reasonable surface area that might give you enough emf when a magnet moves through with the following parameters: Coil diameter = 13mm Time interval of magnet moving through coil = 15 ms Efficiency of magnet/coil combo (the % of B field lines entering loop) = 50%

Explanation / Answer

The electromagnetic induction is e = -N(d(flux))/dt

Given that , we learn that e must be in the order of 1.9 to 2 Volts

The magnet is moved within 15ms

so dt = 15ms

flux = B.A(which will depend on design)

and metrics of awg34

Hence forth you can get number of turns

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