An electron 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 .

Options

A. zero
B. `2hatkN`
C. `-2hatkN`
D. Information is insufficient

Answer

A

Explanation

`vecV_(1)=2hati,vecF_(1)=-2hatu, vecV_(2)=2hatj,vecF_(2)=+2hati`
`vecB=B_(x)hati+B_(Y)hatj+B_(Z)hatk,` From the condition it is sure magnetic field along z-axis.
When `vecv_(3)=2hatkimplies` force is zero