The primary and secondary coils of transformer have P 50 and 1500 t...

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The primary and secondary coils of transformer have
P 50 and 1500 turns, respectively. If the magnetic flux

W
\( \phi \) linked with the primary coil is given by
\( \phi=\phi_{0}+4 t \), where \( \phi \) is in weber, \( t \) is time in second
and \( \phi_{0} \) is a constant, then the output voltage across
the secondary coil is:
(1) \( 90 \mathrm{~V} \)
(2) \( 120 \mathrm{~V} \)
(3) \( 220 \mathrm{~V} \)
(4) \( 30 \mathrm{~V} \)
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