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Answer: b
Explanation: For free space/air, the relative permittivity is unity i.e, εr = 1. Thus χe = εr –1 = 0. The susceptibility will become zero in air.
The susceptibility of free space, often mentioned in the context of magnetism and electromagnetic theory, is effectively zero. This is because magnetic susceptibility quantifies the extent to which a material can become magnetized in an external magnetic field. Since free space (also known as vacuum) does not consist of matter or magnetic materials, it does not become magnetized and therefore its magnetic susceptibility is zero.