What is the permeability of free space?

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Question

What is the permeability of free space?

Options:

A . 4 * 10⁻⁶

B . 4 * 10⁻⁷

C . 4 * 10⁻⁸

D . 4 * 10⁻⁹

Answer: Option B
Answer: (b).4 * 10⁻⁷

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