A) \[4.12\,J\,{{T}^{-1}}\]
B) \[3.12\,J\,{{T}^{-1}}\]
C) \[2.12\,J\,{{T}^{-1}}\]
D) \[1.13\,J\,{{T}^{-1}}\]
Correct Answer: D
Solution :
(d) \[1.13\,J\,{{T}^{-1}}\]. Here, \[N=750\] turns, \[A=5\times {{10}^{-4}}{{m}^{2}},l=3A\] Then. magnetic moment, \[M=NlA=750\times 3\times 5\times {{10}^{-4}}=11250\times {{10}^{-4}}\] \[=1.125\text{ }J{{T}^{-1}}=1.13\text{ }J{{T}^{-1}}\] along the axis of solenoid.
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