In an ideal transformer currents are related as

Option 1: I1 / I2 = N1 / N2

Option 2: I1 / I2 = V1 / V2

Option 3: I1 / I2 = N2 / N1

Option 4: I1 = I2

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Correct Option: 3

Explanation

From power balance V1I1 = V2I2 and V ∝ N, therefore I1/I2 = N2/N1.