A) \[\pi ({{a}^{2}}+{{b}^{2}})i\]
B) \[\frac{1}{2}\pi ({{a}^{2}}+{{b}^{2}})i\]
C) \[\pi ({{a}^{2}}-{{b}^{2}})i\]
D) \[\frac{1}{2}\pi ({{a}^{2}}-{{b}^{2}})i\]
Correct Answer: B
Solution :
m = current x area \[=i(\frac{1}{2}\pi {{a}^{2}}+\frac{1}{2}\pi {{b}^{2}})\] \[=\frac{1}{2}i\pi ({{a}^{2}}+{{b}^{2}})\]
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