In an ideal step-up transformer,if the input voltage and input power are $V_1$ and $P_1$ respectively,and the output voltage and output power are $V_2$ and $P_2$ respectively,then
- A$V_1=V_2 ; P_1=P_2$
- B$V_1>V_2 ; P_1>P_2$
- C$V_1 < V_2 ; P_1 < P_2$
- D$V_1 < V_2 ; P_1=P_2$
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$A$ transformer has $100$ turns in the primary coil and carries $8 \, A$ current. If the input power is $1 \, kW$, the number of turns required in the secondary coil to have $500 \, V$ output is:
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