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In a certain region of space electric field →E and magnetic field →B are perpendicular to each other and an electron enters in region perpendicular to the direction of →B and →E both and moves un-deflected, then velocity of electron is
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|→E| |→B| - →E × →B
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|→B| |→E| - →E . →B
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Correct Option: A
Electron moves undeflected if force exerted due to electric field is equal to force due to magnetic field.
| q|→v||→B| = q|→E| ⇒ |→v| = | ||
| |→B| |
