A) 8.8 A
B) 0.08 A
C) 12.5 A
D) 50 A
Correct Answer: D
Solution :
In a step-up transformer Power in secondary = Power in primary \[{{V}_{s}}{{i}_{s}}={{V}_{p}}{{i}_{p}}\] ...(i) Also, from transformation ratio \[\frac{{{V}_{s}}}{{{V}_{p}}}=\frac{{{N}_{s}}}{{{N}_{p}}}\] Given, \[\frac{{{N}_{p}}}{{{N}_{s}}}=\frac{1}{25},\] \[{{V}_{p}}=200\,V\] \[\therefore \] \[{{V}_{s}}=200\times 25=5000\,V\] From Eq. (i), \[5000\times 2=200\times {{i}_{p}}\] \[\Rightarrow \] \[{{i}_{p}}=50\text{ }A\]
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