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In vacuum or free space, what observations are made?

(a) ρ = ρo, J = 0

(b) ρ = 0, J = Jo

(c) ρ = 0, J = 0

(d) ρ = ρo, J = Jo

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The correct answer is (c) ρ = 0, J = 0

To elaborate: In vacuum or free space, there is no charge or current. Thus, in that case, ρ is equal to zero and the current density, J is also equal to zero.

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