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Circular Kinematics

An electron a...

Question

An electron and a proton are projected with same velocity perpendicular to a magnetic field.Which particle will describe the smaller circle?

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Solution

$_{m a g} =_{c e n} q v B = m \frac{v^{2}}{r} r = \frac{m v}{q B} m_{e} < m_{p} r_{e} < r_{p}$

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