The primary and secondary coil of a transformer have 50 and 1500 turns respectively. If the magnetic flux linked with the primary coil is given by = 0 + 4t , where is in webers, t is time in seconds and 0 is a constant, the output voltage across the secondary coil is

1. A. 120 volts
2. B. 220 volts
3. C. 30 volts
4. D. 90 volts

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