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Detecting a secret telephone conversation? Some people think that we can detect a secret phone conversation by separating the wires that come out of the telephone and by placing a pair of headphones along one of the telephone wires (see the figure attached, the wires are isolated). Will such a...

Hi! Here is probably a simple problem but I can't solve it: We have an inductor (just a coiled wire) in series with a light bulb, connected to an ideal battery. The light bulb is shining and we measure the intensity of light. Now we introduce a metal piece inside the coil. AFTER the piece is...