13. George has a bar magnet and a coil connected to a battery. To perform an experiment, he needs to use different values of current through the wire. How can he generate different values of electric current through the wire without connecting any other device in the circuit?
My answer: Different current values can be generated by placing bar magnet inside coil and moving magnet back and forth inside coil. This will induce different current values depending on how fast bar magnet is moved
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He could also increase or decrease the number of turns on the coil.
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