1.

What is the permeability of free space?

A. 4 * 10<sup>-6</sup>
B. 4 * 10<sup>-7</sup>
C. 4 * 10<sup>-8</sup>
D. 4 * 10<sup>-9</sup>
Answer» C. 4 * 10<sup>-8</sup>


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