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In a chamber, a uniform magnetic field o...

In a chamber, a uniform magnetic field of 6.5 G `(1G=10^(-4)T)` is maintained. An electron is shot into the field with a speed of `4.8xx10^(6)m s^(-1)` normal to the field. Explain why the path of the electron is a circle. Determine the radius of the circular orbit.
`(e=1.5xx10^(-19)C, m_(e)=9.1xx10^(-31)Kg)`

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