1.

A charged particle with charge q enters a region of constant, uniform and mutually orthogonal fields vecE and vecB with a velocity vecv perpendicular to both vecE and vecB, and comes out without any change in magnitude or direction of vecv. Then

Answer»

`vecv=vecBxxvecE//B^(2)`
`vecv=vecExxvecB//E^(2)`
`vecv=vecBxxvecE//E^(2)`
`vecv=vecExxvecB//B^(2)`

Solution :`vecv=(vecE xx vecB)/(B^(2))`
`rArr v=(EB SIN 90^(@))/(B^(2))`
`:. V=(EB)/(B^(2))=(E)/(B)`


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