Question:
The alternating e.m.f. induced in the secondary coil of a transformer is mainly due to
The alternating e.m.f. induced in the secondary coil of a transformer is mainly due to
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Physics Tip : Transformers only work with Alternating Current (AC) because Direct Current (DC) produces a steady magnetic field, which cannot induce an e.m.f. in the secondary coil.
Updated On: Apr 23, 2026
- varying electric field
- varying magnetic field
- the iron core
- heat produced in the coil
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The Correct Option is B
Solution and Explanation
Concept:
Physics (Electromagnetism) - Mutual Induction in Transformers.
Step 1: Understand transformer operation. A transformer consists of two coils linked by a common magnetic flux. When an alternating current flows through the primary coil, it creates a magnetic field that changes over time.
Step 2: Identify the cause of induction in the secondary. According to Faraday's Law of Induction, a varying magnetic field through a conductor induces an electromotive force (e.m.f.).
Step 3: Conclusion. The secondary coil experiences an e.m.f. because the changing magnetic field produced by the primary coil passes through it. $$ \therefore \text{The induced e.m.f. is primarily due to a varying magnetic field.} \text{} $$
Step 1: Understand transformer operation. A transformer consists of two coils linked by a common magnetic flux. When an alternating current flows through the primary coil, it creates a magnetic field that changes over time.
Step 2: Identify the cause of induction in the secondary. According to Faraday's Law of Induction, a varying magnetic field through a conductor induces an electromotive force (e.m.f.).
Step 3: Conclusion. The secondary coil experiences an e.m.f. because the changing magnetic field produced by the primary coil passes through it. $$ \therefore \text{The induced e.m.f. is primarily due to a varying magnetic field.} \text{} $$
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