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Answer to Question #13247 in Electricity and Magnetism for Soma Shekar

Question #13247
How do you change the polarity of an electromagnet automatically?
I know its been asked many times before.. but pls let me know if it is possible to change the polarity automatically at a particular rate, which can be controlled by us..
eg: polarity changes at around 10 times per second.. and using a knob, we can increase or decrease it.. im an amateur.. so circuit diagrams would be most helpful.. hope im clear.. thank you..
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