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Q.

The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux ϕ linked with the primary coil is given by ϕ=ϕ0+4t, where ϕ is in weber, t is time in second and ϕ0 is a constant, the output voltage across the secondary coil is :

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a

90 V

b

120 V

c

220 V

d

30 V

answer is B.

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Detailed Solution

Induced emf in primary coil Ep=dϕdt=ddtϕ0+4t=4 VInduced emf in secondary coilEsEp=NsNp⇒Es4=150050⇒Es=120 V

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