Can someone please explain to me why this identity is valid? Especially how the author gets to this:
\(\nabla_q \times \frac{M_c}{|r_{qa}|} = -M \times \nabla_q \frac{1}{|r_{qa}|}\).
I assume that c stands for 'constant'..?
\(\nabla_q \times \frac{M_c}{|r_{qa}|} = -M \times \nabla_q \frac{1}{|r_{qa}|}\).
I assume that c stands for 'constant'..?
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