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    Lily25's Avatar
    Lily25 Posts: 4, Reputation: 1
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    #1

    Jul 7, 2012, 01:06 PM
    how much current to cancel earth's magnetic field?
    It can be shown the magnetic field in a long narrow tube is uniform and given by B(Tesla =1.26E-6 N I(amp)?

    where N is number of wire loops/meter. Assuming the solenoid is aligned along the Earth's magnetic field,how much current is needed to cancel the Earth's field?
    earth's magnetic field is 10^-4 Tesla
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Jul 9, 2012, 04:36 AM
    Given the equation , and given that the earth's magnetic field is , set these equal to each other and solve for the current, I.
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