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A charged particle has acceleration veca...

A charged particle has acceleration `veca=2hati=xhatj` in a magnetic field `vecB=-3hati+2hatj-4hatk`.Find the value of `x`.

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`becausevecF_|_vecB`
`therefore veca_|_vecB`
`therefore veca.vecB=0`
`therefore (2hati+xhatj).(-3hati+2hatj-4hatk)=0`
`implies-6+2x=0impliesx=3`
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