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The Circular Motion

An electron b...

Question

An electron beam passes through a region of crossed electric and magnetic fields of strength $E$ and $B$ respectively. For what value of electron-speed the beam will remain undeflected?

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Solution

The electron beam will pass undeflected if electric force and magnetic force on
electron is equal and opposite i.e., $e E = e v B$
or $v = \frac{E}{B}$

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