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 webers, `t` is time in second and `phi_(0)` is a constant, the output voltage across the secondary coil is

`30 V`

`90 V`

`120 V`

`220 V`

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