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Found 3 results

  1. PaperBoy

    Inductance

    Along with capacitors, inductors still make up a very important part of modern day circuitry. Often, the two are used in conjunction to great effect. Inductors usually consist of an electric current passing through a coil of wire. The coil may be in a circular or straight shape itself. The purpose of an inductor is to store voltage via a magnetic field in the coil, according to Faraday's Law of electromagnetic induction. Nowadays, inductors are often used to remove the mains hum of an AC current. This hum can vibrate the circuit, obstructing power lines, and can usually be easily heard, so the inductor coupled with a capacitor reduces the hum. Similarly, they can be used to reduce electromagnetic interference. EMI is the interference outside sources of electromagnetic power exert on a circuit, and can ruin a good circuit rather easily. Inductors help to negate this interference so that the electricity can pass normally and the circuit will function Inductors can also convert AC current to DC. Sadly, inductors are now being phased out due to their various side effects over extended use. However, one can't deny their important contribution to modern circuitry!
  2. One concept I always struggle with imparting to my kids in AP Physics C: E&M each year is how to write the sign for the potential drop across an inductor in an RL or LC circuit. We, of course, always start out with Faraday's Law (and avoid KVL since it is invalid with a changing magnetic flux): But then, when replacing the time rate of change of the magnetic flux through the inductor with L*dI/dt, there's always the question of whether the current is increasing or decreasing, and how best to describe this to students. If we follow the circuit in a clockwise fashion from the positive side of the battery, the first electric field I see for the voltage source is the negative sign, hence -V on the left-hand-side. Then, as we follow the circuit the rest of the way around, I end up with the equation: which is opposite in sign to most of the standard answers I can find. I have regularly "wiggled around" this problem by telling students to think about which way the current through the inductor is changing to choose your sign, but there has to be a more elegant solution! This, below, makes sense to me... Why, then, in problems like AP-C FR EM2 from 2005 as you do the same basic analysis in part B is the sign of LdI/dt reversed? I struggle with this discrepancy every year. Any help you can provide would sure be appreciated!
  3. FizziksGuy

    HANDOUT: Electromagnetism Tutorial

    Version 1

    114 downloads

    Handout / guide sheet for students in calculus-based physics courses such as AP Physics C studying electromagnetic induction.

    Free

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