The primary and secondary coils of a tra...

The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux `phi` linked with the primary coil is given by `phi = phi_0 + 4t`, where `phi` is in weber t is time second and `phi_0` is a constant , the output voltage across the secondary coil is:

A

`30 volts

B

90 volts

C

120 volts

D

220 volts

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