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    Welshdodds's Avatar
    Welshdodds Posts: 1, Reputation: 1
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    #1

    Oct 16, 2010, 06:43 PM
    E=L(R-r)/2R
    Make r subject
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Oct 16, 2010, 11:56 PM

    1. Cross multiply
    2. Distribute the L(R-r)
    3. Bring all the terms in R on one side and all the others on another side of the equal sign.
    4. Factorise R.
    5. Divide by the coefficient of R.

    Post what you get! :)
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