Older radios used an inductor with a fixed value and a variable capacitor to tune into a particular radio station.  Suppose you wanted to listen to the news on WKSU, with a frequency of 89.7 MHz (that's megahertz) on a radio with a 3.99 μH (that's microhenry) inductor.  What capacitance, C, in pF (that's picofarads, or 10-12 F, would resonate with that inductor at that frequency?  Express your answer in normal notation, in picofarads.

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Magnetic Force

A magnetic force arises when a charged particle or a current-carrying conductor is placed in a magnetic field. It is created because of the movement of the charged particles.