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Which of the following is not a dimensionless quantity?
Explanation
As $B = \mu_{0}i/(2\pi r)$. $[\mu_{0}] = [B \times 2\pi r]/I = [(N/Am) \times (m/A)] = [N/A^{2}] = MLT^{-2}A^{-2}$. Clearly, $\mu_{0}$ is not a dimensionless quantity.