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Concepts Of Physics MCQ Edition [Volume 2]PhysicsAlternating Current

A transformer features 50 turns in the primary and 100 in the secondary. When the primary is connected to a 220 V DC supply, determine the voltage across the secondary.

Options

  1. A0
  2. B110 V
  3. C220 V
  4. D440 V

Correct answer

A. 0

Step-by-step solution

A transformer operates on the principle of mutual induction, which requires a changing magnetic flux to induce an electromotive force in the secondary coil. When a DC supply is connected to the primary coil, a constant current flows through it, producing a steady magnetic field. Thus, the magnetic flux linked with the secondary coil does not change with time. According to Faraday's law of electromagnetic induction, the induced EMF is given by e = -N d dt . Since is constant for a DC supply, d dt = 0 . Therefore, th

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