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    heyyalliee's Avatar
    heyyalliee Posts: 37, Reputation: 1
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    #1

    Mar 25, 2011, 07:49 AM
    Finding the Magnetic Filed on a Long Straight Wire
    Find the magnetic field 6.70 cm from a long, straight wire that carries a current of 7.80 A.
    answer= B_____T

    I do not know what else to do for this problem. I found this formula but it is not giving me the right answer.
    B= Uo*I/4pi r^2

    Is my math wrong or am I going about this the wrong way?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 25, 2011, 09:04 AM

    The formula you want is:



    where
    heyyalliee's Avatar
    heyyalliee Posts: 37, Reputation: 1
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    #3

    Mar 25, 2011, 03:17 PM
    Comment on ebaines's post
    I knew I was off by something... thanks for your help!
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