alternating current Questions

Alternating current cannot be measured by a D.C. ammeter because:

In an LCR series a.c. circuit, the voltage across each of the components, $L,C$ and $R$ is $50\text{V}$. The voltage across the $LC$ combination will be:

In a uniform magnetic field of induction $B$, a wire in the form of a semicircle of radius $r$ rotates about the diameter of the circle with angular frequency $\omega$. The axis of rotation is perpendicular to the field. If the total resistance of the circuit is $R$, the mean power generated per period of rotation is:

In a LCR circuit, capacitance is changed from $C$ to $2C$. For the resonant frequency to remain unchanged, the inductance should be changed from $L$ to: