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Homework Help: Question on Electromagnatic Induction

  1. Apr 16, 2014 #1
    1. The problem statement, all variables and given/known data
    9 volt battery
    1 Nail
    Few paper clips
    Cooper Wire

    2. Relevant equations
    Why my Electromagnetic Induction experiment failed ? It did not create electromagnetic field to attract surrounding paper clips. What are missing here ? How to do successful home-made electromagnetic Induction ? Please help.

    3. The attempt at a solution
    Made 75 rounds around the Nail to create Solenoid.
    Wire connected to battery + -
    Turned on the switch
  2. jcsd
  3. Apr 16, 2014 #2


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    Was the wire insulated ?
  4. Apr 16, 2014 #3


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    Hello mike2011,

    Welcome to Physics Forums! :smile:

    If you are using your own nail (rather than one provided for you), make sure the nail is iron or steel based and not aluminum. Aluminum nails will not work for this experiment (you need a ferromagnetic material as the electromagnet core. Aluminum is not a ferromagnetic material).

    [Edit: you can check this using a standing magnet, like a refrigerator magnet. If the nail is attracted to the magnet it should work. If it is not attracted to the magnet, it's probably an aluminum nail.]

    The copper wire needs to be insulated for the part that wraps around the nail. If the wire is not insulated it will just create a short circuit and nothing will happen, except it might get very hot.

    The insulation needs to be stripped off the wire at the parts that connect to the battery-terminals and switch terminals. Electrical contact needs to be made at these parts of the wire.
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