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নিচের কোনটি লরেঞ্জ বল (Lorentz Force)?

\vec{F} = q \vec{F}

\vec{F} = q (\vec{v} \times \vec{B})

\vec{F} = (\vec{F} \times \vec{v} \times \vec{B})

\vec{F} = q \vec{v} . \vec{B} \times \vec{F}

None of these

ANS : 3

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