$B =\mu_{0}( H + I )$
$=\mu_{0}\left(\frac{ N }{2 \pi r } \times i + I \right)$
Substitute the values.
$10=\mu_{0}\left(\frac{ N }{2 \pi r } \times i + I \right)$
$I=\frac{10}{4 \pi \times 10^{-7}}-\frac{400 \times 2 \times 2}{2 \pi \times 2.5}$
$=\frac{10^{8}}{4 \pi}$
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Which of the following statement($s$) is(are) correct?
$(A)$ The magnitude of the total work done in the process $A \rightarrow B \rightarrow C$ is $144 kJ$.
$(B)$ The magnitude of the work done in the process $B \rightarrow C$ is $84 kJ$.
$(C)$ The magnitude of the work done in the process $A \rightarrow B$ is $60 kJ$.
$(D)$ The magnitude of the work done in the process $C \rightarrow A$ is zero.
