A) 30 mA
B) 60 mA
C) 3 A
D) 6 A
Correct Answer: C
Solution :
[c] Magnetic field in solenoid \[B={{\mu }_{0}}ni\] \[\Rightarrow \,\,\,\,\frac{B}{{{\mu }_{0}}}=ni\] (Where n = number of turns per unit length) \[\Rightarrow \,\,\,\,\frac{B}{{{\mu }_{0}}}=\frac{Ni}{L}\Rightarrow 3\times {{10}^{3}}=\frac{100i}{10\times {{10}^{-2}}}\] \[\Rightarrow \,\,\,i=3A\]You need to login to perform this action.
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