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নিচের কোনটি $\in_{0} μ_{0}$ -এর একক? (Which one below is unit of $\in_{0} μ_{0}$ )

m^{2} s^{- 2}

m^{1 / 2} s^{- 1 / 2}

m^{- 1} s

m^{- 2} s^{2}

ANS : 4

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