Question

In the circuit shown here, the voltage across $L$ and $C$ are respectively $300V$ and $400V$. The voltage $E$ of the ac source is

• A. $400Volt$
• B. $500Volt$
• C. $100Volt$
• D. $700Volt$

Answer 1

The correct option is C $100Volt$

we know that the voltage of $C$ & $L$ are always in Opposite phase

So Net voltage i.e., $V_L$ & $V_C$ & resultant

will be $v=\sqrt{(V_L-V_C{)}^2}=\sqrt{(300-400{)}^2}$

$V=100V$

This formula is directed from

$V_{net}=\sqrt{(V_L-V_C{)}^2+V_R^2}$