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In a certain region of space, electric field vecE and magnetic field vecB are perpendicular to each other. An electron enters in the region perpendicular to the direction of both vecB & vecE and moves undeflected. Find the velocity of electron. |
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Answer» Solution :NET force an electron moving in the combined electric FIELD `VECE` and MAGNETIC field `vecB` is `vecF = - E [vecE + vecv xx vecB]` Since electronmoves undeflected then `vecF = 0 vecE + (vecv xx vecB)= 0 ` `|vecE| = (|vecv| xx | vecB|) rArr |vecv| = (|vecE|)/(|vecB|) ` |
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