An Electron Is Accelerated from Rest Through a Potential Difference $\vec { B }$

An electron is accelerated from rest through a potential difference of 3.75 kV.It enters a region where a uniform 4.0-mT $\vec { B }$ field is perpendicular to the velocity of the electron.Calculate the radius of the path this electron will follow in the magnetic field.(e = 1.60 × 10^-19 C,m_electron = 9.11 × 10^-31 kg)

A) 1.2 cm
B) 2.2 cm
C) 3.2 cm
D) 4.2 cm
E) 5.2 cm

Correct Answer:

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