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you see .. induction motors work a bit differently than normal ones .. a rotating magnetic field is set up by 3 radial pairs of electromagnets . and so induce a current in the squirrel cage rotor .. the magnetic feild interact and cause the rotor to rotate.. and for Q10, i think a transister...

i thought Q4 was B lol .. cause when we did the experiment it turned out a linear graph .. how do we know its a curve ??