A) four times
B) same
C) half
D) double
Correct Answer: A
Solution :
From formula, the magnetic field at the centre is given by \[9.10\times {{10}^{14}}Hz\] or \[6\times {{10}^{14}}Hz\] Here: \[4\times {{10}^{14}}Hz\] \[0.4A{{m}^{2}}\] \[1.6A{{m}^{2}}\] Therefore, \[20A{{m}^{2}}\]
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