Need help with my college physics homework...?
Question:
Here is my problem:
A solenoid of length 2.8cm and diameter 0.75cm is wound with 160 turns per cm. If the current in the solenoid is decreasing at a rate of 35.0 A/s, what is the induced emf in one of the windings? in the entire solenoid.
I have no idea how to set up this problem and how to do it!! My professor doesn't show us how to solve these kinds of equations... the textbook doesn't help either... I'm not a physics major... I'm a med student who has to pass this class to move on down the college road...
Answer:
that is so weird, i have a college physics exam on that too! here's the formula to solve it:
induced emf is equal to the negative inductance times the current rate.
so inductance is equal to the (mu knot (4 pi times 10^ -7) times 16000 squared times the area of the solenoid) divided by the length of the solenoid.
plug that number in to the induced emf formula so it should be -L *the rate (make sure the rate is negative since it's decreasing!)
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