I did some experiment about Faraday’s Law of Induction. In part A I did experime

Question

I did some experiment about Faraday’s Law of Induction.

In part A I did experiment like this.

I drop the wand in some particular height and got the graph of voltage and average of voltage(just first peak) by computer and calculate ?B.

1. In my experiment, the first pick of the voltage graph have positive sign, and the second pick of the voltage graph have negative sign. Why the second peak have opposite sign about the first one?

2. When wand passes the center of magnet, the value of voltage was almost 0V. Why?

3. When the angle between wand (the position that drop the wand) and the central axis become bigger, the value of average voltage of first peak become lower. Why?

4. When the interval of the magnet plate becomes bigger, the value of average voltage of first peak becomes bigger too. Why?

In part B, I removed the magnet plate (the magnet poles are remain. Just remove the plate.). And I did experiment twice. First, do this experiment without resister to get the value of energy lost by friction (mechanical loss). second, do this experiment with resister to get the value of energy lost by resistors (thermal dissipation loss).

5. I just did experiment by manual, but I really don’t understand why I dothis experiment. Please explain why I do this experiment. And why remove the magnet plate in this part?

Explanation / Answer

(1) Induced emf is always to the opposite to the direction it produced it.

AC circuit has positive and negative loops.

(2) Change is flux is zero. therefore induced emf is zero

(3) Flux = B . A = B A cos theta

Which is less than when dropped perpendicular ( cos 0 = 1)

Too many question... Please post separately... :)

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