A) \[4\text{ }A/{{m}^{2}}\]
B) \[1\text{ }A/{{m}^{2}}\]
C) \[2\text{ }A/{{m}^{2}}\]
D) \[8\text{ }A/{{m}^{2}}\]
Correct Answer: A
Solution :
Given \[I=40\,A;\,A=10\,{{m}^{2}}\] \[\therefore \]Current density, \[J=\frac{I}{A}\] or \[J=\frac{40}{10}=4\,A/{{m}^{2}}\]
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