A) \[6.9\times {{10}^{-2}}A{{m}^{2}}\]
B) \[2.3\times {{10}^{-2}}A{{m}^{2}}\]
C) \[{{10}^{-2}}A{{m}^{2}}\]
D) \[{{10}^{-3}}A{{m}^{2}}\]
Correct Answer: A
Solution :
: Radius of coil\[=\frac{7}{2}cm=3.5\times {{10}^{-2}}m\] Magnetic moment \[=NIA\] \[\therefore \] \[M=24\times 0.75\times \pi \times {{(3.5\times {{10}^{-2}})}^{2}}\] \[=24\times 0.75\times 3.14\times 3.5\times 3.5\times {{10}^{-4}}\] \[=692.3\times {{10}^{-4}}A{{m}^{2}}\] \[=6.9\times {{10}^{-2}}A{{m}^{2}}\]
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