Q150 / 180 · COMEDK 2013 · Physics

The primary of a transformer when connected to a DC battery of $10 \mathrm{~V}$ draws a current of $1 \mathrm{~mA}$. The number of turns of the primary and secondary windings are 50 and 100 , respectively. The voltage in the secondary and the current drawn by the circuit in the secondary are respectively

  • A
    $20 \mathrm{~V}$ and $2.0 \mathrm{~mA}$
  • B
    $10 \mathrm{~V}$ and $0.5 \mathrm{~mA}$
  • Correct answer
    C
    $0$ and $0$
  • D
    $20 \mathrm{~V}$ and $0.5 \mathrm{~mA}$

Solution

A transformer does not work on DC supply because mutual induction does not take place due to constant value of current. So, $V_{\mathrm{S}}=0$ and $I_{\mathrm{S}}=0$.

Hence, the correct answer is option: 'C'.

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