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August 5th, 2017, 03:04 PM   #1
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electromagnetism Problem

Hi

I would like to now how the numerator became 4 in the problem attached. Its a complex fraction but I am unsure how Qaz became 4Qaz.

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August 5th, 2017, 04:51 PM   #2
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Sorry I realise I should have posted this in a more appropriate thread. As the problem is for electromagnetism but my question is relating to fractions. My apologies.

Any help is appreciated
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August 5th, 2017, 05:03 PM   #3
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$ |z - \frac{d}{2} |^2 = \frac{1}{4} |2z - d|^2 $. Similar is true for $ |z + \frac{d}{2}|^2$.
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Last edited by Joppy; August 5th, 2017 at 05:05 PM.
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