D

F/unit length =

When i1 = i2 = 1 A, and d = 1 m, F = 2 x 10-7 Nm-1 by definition. It follows that j0 = 4nx 10-7 NA-2 (permeability of free space).

Definition of a coulomb, the unit of charge: 1 A = Cs

The dimensions of the speed of electromagnetic radiation:

4ne0d

^ permittivity of free space e0 = 8.854 x 10 12 C2 N 1 m:

m0 e0

m0i1i2

(numerically 2.998 ms 1)

0 0

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