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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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`:'vecF_|_vecB , :.veca_|_vecB , :.veca.vecB=0`
`:. (2hati+xhatj).(-3hati+2hatj-4hatk)=0 rArr -6+2x=0 rarr x=3`
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