A) 7 A
B) 14 A
C) 28 A
D) 42 A
Correct Answer: C
Solution :
Given, \[L=25\,\,mH\] \[=25\times {{10}^{-3}}H\], \[f=50\,Hz\] \[{{V}_{rms}}=220\,V\] and \[{{f}_{2}}=50\,Hz\] \[{{X}_{L}}=2\pi fL\] \[=2\times \frac{22}{7}\times 50\times 25\times {{10}^{-3}}\Omega \] The rms current in the circuit is \[{{I}_{rms}}=\frac{{{V}_{rms}}}{{{X}_{L}}}\] \[=\frac{220}{2\times \frac{22}{7}\times 50\times 25\times {{10}^{-3}}}\] \[=\frac{7\times 1000}{2\times 5\times 25}\] \[{{I}_{rms}}=28\,A\]
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