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An electric charge q1 moving with the velocity i produces a
magnetic field B given by
Orl
B =
r2
where r points from q1 to the point at which B is measured (Biot-Savart
law,
(b) Write out the corresponding magnetic force F21 that q2 exerts on
91. Define your unit radial vector. How do F12 and F21 compare?

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