A) \[{{\mu }_{0}}nl(1-\chi )\]
B) \[{{\mu }_{0}}nl\,\chi \]
C) \[{{\mu }_{0}}n{{l}^{2}}(1+\chi )\]
D) \[{{\mu }_{0}}nl(1+\chi )\]
Correct Answer: D
Solution :
(d) \[{{\mu }_{0}}nl(1+\chi )\] Magnetic field inside a long solenoid with an iron core inside it is \[B=\mu nl\] But \[\mu ={{\mu }_{0}}(1+\chi )\therefore \,B={{\mu }_{0}}(1+\chi )nl\]
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