Magnetic Forces and Fields

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Question description

What is the time taken for an electron to complete one orbit with a radius of 5.0cm in a magnetic field with a strength of 0.80T? Answer: 4.5x10^-11 s

What is the strength of the magnetic field required to make an alpha particle, moving at a speed of 6.60x10^6 m/s in a path of radius 2.00m? Answer: 6.82x10^-2 T

I cannot seem to get either answer correct. I have tried various ways of answering the question but seem to be missing something. Please help me figure out what to do. Thanks. 

Tutor Answer

(Top Tutor) Daniel C.
School: Boston College
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