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The force vecF experienced by a particle...

The force `vecF` experienced by a particle of charge q moving with velocity `vecv` in a magnetic field `vecB` is given by `vecF = q(vecv xx vecB)` . Of these, name the pairs of vectors which are always at right angles to each other.

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`vecF and vecv` as well as `vecF and vecB` are the pairs which are always at right angles to each other.
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