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An electron moves in a uniform circular motion under the action of an external magnetic field.
-19
Consider the charge of the electron 9 = -1.6 × 10-
v = 2.8 X 107
[C], the speed of the electron
B = 2.1 x 10-³
[m/s] and the magnitude of the external magnetic field
[T]. Calculate the radius R of the circle formed by the electron during its displacement. Write your
answer in centimeters and round to the first decimal.

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