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An elctron moving with a velocity overse...

An elctron moving with a velocity `oversetrarrV_(1) = 2hatim//s` at a point in a magnetic field experiences a force `oversetrarrF_(1) = 2hatjN` if the elctron is moving with a velocity `oversetrarrV_(2) = 2hatj m//s` at the same point, it experiences a force `oversetrarrF_(2) =+2hatiN` The force the electron wolud experience if it were moving with a velocity `oversetrarrV_(3)=2hatkm//s` at the same point is .

A

zero

B

`2hatkN`

C

`-2hatkN`

D

information is insufficient

Text Solution

Verified by Experts

The correct Answer is:
A
From condition one and two we find that magnetic field is in `hatk` In third situation filed and `v` are in same direaction so force will be zero
`-2hatj = - e[2hati xx Bn] implies hatj = e[hati xx Bhatn]`
`hatn = -hatk` .
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