A 200/2000 V, 1-ϕ, 50 Hz transformer has primary and secondary resistance of 5 Ω and 20 Ω, respectively. Find the value of equivalent resistance of the transformer referred to the primary side.
1
20 Ω
2
10 Ω
3
5.2 Ω
4
12.4 Ω
5
6.2 Ω
5
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