• # question_answer A transformer is used to step-up an transformation $emf$ of 220 V to 4.4 kV in order to transmit 6.6 kV of power. If the primary coil has 100 turns, what is the number of turns in the secondary? A)  20                               B)  200              C)  2000                           D)  20000

We have, ${{N}_{S}}=\left( \frac{{{\rho }_{S}}}{{{\rho }_{P}}} \right)\times {{N}_{P}}$ $x$ Here, $\therefore$ and $f(x)$ are see secondary and primary voltages of the transformer.