\( B=\mu_{0} \mu_{r} H \). In the given equation, \( \mu_{r} \) is ...

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\( B=\mu_{0} \mu_{r} H \). In the given equation, \( \mu_{r} \) is called
(a) relative magnetic permeability of substance
(b) magnetic susceptibility of substance
(c) magnetic permeability of substance
(d) Both (a) and (c)
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