How to make an RL series circuit working model?

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"A battery to a resistor (R) to a coil (L) and a switch should do it. A meter or magnetic compass next to the coil can provide indication of operation."

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"An RL circuit is one that contains only resistors and inductors. The simplest possible RL circuit is the series circuit shown below: Since the resistor and inductor are in series, we can immediately write the impedance of the circuit: Z = R +XL We know that XL depends on the frequency of the AC current flowing through the inductor: "

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