STANDARD Physics Transformers MCQ Question
The primary and secondary coil 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 webers, t is time in seconds and ϕ₀ is a constant, the output voltage across the secondary coil is
120 volts
220 volts
30 volts
90 volts
Correct Answer
Detailed Explanation
The induced emf in the secondary coil is given by the formula E = -N(dϕ/dt). With 1500 turns and dϕ/dt = 4 Wb/s, the voltage is 1500 * 4 = 6000 V. However, due to the turns ratio, the output voltage is reduced to 120 V.
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