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1. $[μ_{0} = 4 π \times 10^{- ?} {TmA}^{- 1}]$

A. $4 \times 10^{- 5}$
B. $4 \times 10^{- 5}$
C. $4 \times 10^{- 5}$
D. $4 \times 10^{- 5}$

Answer: Option B

Explanation:

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