A)
B)
C)
D)
Correct Answer: D
Solution :
\[{{\mu }_{r}}=1+\frac{I}{H}\]; as we know I dependent on H, initially value of \[\frac{I}{H}\] is smaller so value of mr increases with H but slowly but with further increases of H value of \[\frac{I}{H}\] also increases i.e. mr increases speedily. When material fully magnetised I becomes constant then with the increase of H (\[\frac{I}{H}\] decreases) mr decreases. This is confirm with the option (d).
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