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An electron is observed to be traveling in a circular trajectory of radius 3.2 µm. How many revolutions around this circle does it complete in one second if the magnetic field perpendicular to the trajectory is 1.0 T? (mc = 9.11 × 10⁻³¹ kg, e = 1.6 × 10⁻¹⁹ C)
Sagot :
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