A) \[0.4\,A{{m}^{2}}\]
B) \[1.6\,A{{m}^{2}}\]
C) \[20\,A{{m}^{2}}\]
D) \[8.0\,A{{m}^{2}}\]
Correct Answer: A
Solution :
The magnetic moment or magnetic dipole moment is a measure of the strength of a magnetic source. The magnetic moment is denned as pole strength multiplied by the distance between the poles, \[M=m\times 2l\] Given, \[2l=10\,cm=10\times {{10}^{-2}}m,\,m=4\,A-m\] \[\therefore \] \[M=0.10\times 4=0.4\,A-{{m}^{2}}\] Note: Magnetic moment is a vector quantity pointing along the axis of the magnet from S to N.
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