Consider a wire with charges moving with speed 'v'and '-v' in frame F (with charge q at distance s away moving at speed u).(adsbygoogle = window.adsbygoogle || []).push({});

In frame F', the charge q is stationary, and so the speeds of the charges in the wire are v_{+}and v_{-}, where v_{-}> v_{+}

Hi guys, I have trouble following through the proof in step 12.81 and 12.82:

How did they get rid of the ± in the denominator? I tried using a^{2}- b^{2}= (a+b)(a-b) but it doesn't match the expression:

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# Magnetism as a Relativistic Phenomenon

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