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An electric charge q1 moving with the velocity v1 produces a
magnetic field B given by
В
Orl
47
r2
where î points from q1 to the point at which B is measured (Biot-Savart
law,
(a) Show that the magnetic force F12 on a second charge q2, velocity
v2 due to the first one, is given by the triple product
lo 9192
F12=
47 r2
Üz × (01 × î).

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