Work done by the magnetic Lorentz force on a moving charge

1. A.
   zero
2. B.
   one
3. C.
   infinity
4. D.
   $qB\sin\theta$

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1. A.
   zero
2. B.
   $\vec{V} \times \vec{B}$
3. C.
   $\vec{V} \times \vec{V}$
4. D.
   $q(\vec{V} \times \vec{B})$

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