A) \[2.0\text{ }A\]
B) \[2.5\,\,A\]
C) \[3.0\,\,A\]
D) \[3.5\,\,A\]
Correct Answer: B
Solution :
Given, \[L=1\text{ }m,\text{ }N=1000\] Number of turns per unit length \[n=\frac{N}{L}=\frac{1000}{1}=1000\] Magnetic field inside a long solenoid \[B={{\mu }_{0}}nI\] \[\Rightarrow \] \[3.14\times {{10}^{-3}}=4\times 3.14\times {{10}^{-7}}\times 1000\times I\] \[\Rightarrow \] \[10=4\times I\] \[\Rightarrow \] \[I=25\,A\]
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