An electric charge q1 moving with the velocity v1 produces a magnetic field B given by Orl r2 В 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 = 4T r2 Üz × (01 × î).
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