STANDARDPhysics-Electromagnetic Induction
STANDARD Physics Transformers MCQ Question
Type: MCQ-conceptual-Medium-Class 12
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
A
120 volts
B
220 volts
C
30 volts
D
90 volts
Correct Answer
Option A
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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