# An electron is accelerated from rest by a potential difference of 412 V. It then enters a uniform magnetic field of magnitude 188 mT with its velocity perpendicular to the field. Calculate (a) the speed of the electron and (b) the radius of its path in the magnetic field.

1 answer

###### Question:

An electron is accelerated from rest by a potential difference of 412 V. It then enters a uniform magnetic field of magnitude 188 mT with its velocity perpendicular to the field. Calculate (a) the speed of the electron and (b) the radius of its path in the magnetic field.

## Answers

Explanation:Given that,Potential difference, V = 412 VMagnitude of magnetic field, B = 188 mT(a) The potential energy of electron is balanced by its kinetic energy as :[tex]eV=\dfrac{1}{2}mv^2[/tex]v is speed of the electron[tex]v=\sqrt{\dfrac{2eV}{m}} \\\\v=\sqrt{\dfrac{2\times 1.6\times 10^{-19}\times 412}{9.1\times 10^{-31}}} \\\\v=1.2\times 10^7\ m/s[/tex](b) When the charged particle moves in magnetic field, it will move in circular path. The radius of the circular path is given by :[tex]r=\dfrac{mv}{eB}\\\\r=\dfrac{9.1\times 10^{-31}\times 1.2\times 10^7}{1.6\times 10^{-19}\times 188\times 10^{-3}}\\\\r=3.63\times 10^{-4}\ m[/tex]Hence, this is the required solution. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â

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