If a electron velocity is (2hatixx3hatj)` and it subjected to a magnetic field `4hatk` then

If a electron velocity is (2hatixx3hatj)` and it subjected to a magnetic field `4hatk` then
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If a electron velocity is (2hatixx3hatj)` and it subjected to a magnetic field `4hatk` then A. speed of electon ... Both (a) and (b) D. None of above
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