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85. Two electrons move near each other and at the instant shown
in Figure P28.85 are 2.0 mm apart. The speed of electron 1
is v, = 300 m/s, that of electron 2 is vz = 500 m/s, and the
directions of motion are as shown in Figure P28.85. Determine
the magnitude and direction of (a) the magnetic force exerted
by electron 1 on electron 2 and (b) the magnetic force exerted by
electron 2 on electron 1. .
Figure P28.85
2.0 mm

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