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লরেঞ্জ বল হচ্ছে -

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

\vec{F} = q (\vec{E} \times \vec{V} \times \vec{B})

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

\vec{F} = q (\vec{E} + \vec{V} \times \vec{B})

ANS : 4

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