An electron is accelerated from rest by a potential difference of \( 380 \mathrm{~V} \). It then...

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An electron is accelerated from rest by a potential difference of \( 380 \mathrm{~V} \). It then enters a uniform magnetic field of magnitude \( 200 \mathrm{mT} \) 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.
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