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A charged particle moving in a magnetic field `vec(B) = hat(i) - hat(j)` tesla, has an acceleration of `2 hat(i) + alpha hat(j)` at some instant. Find the value of `alpha`

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`vecF=q(vecvxxvecB)`
`veca=q/m(vecvxxvecB)`
`impliesveca_|_vecB`
Thus `veca, vecB=0`
`=(2hati+alpha hatj)(hati-hatj)=0`
`implies 2-alpha=0`
`impliesalpha=2`
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