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4. An electron is moving in a uniform magnetic field of 0.25 T; its velocity components parallel and perpendicular to the field are both equal to 3.1-100 m/s. (a) What is the radius of the electrons spiral path? (b) How far does it move along the field direction in the time it takes to complete a full orbit about the field direction?

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B: о.as T 2 8 2B

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