निम्नलिखित में से कौन सा उपकरण स्थिर अवस्था में दिष्ट धारा (DC) को अपने से होकर गुजरने नहीं देता है?

An alternating voltage source of variable angular frequency ω and fixed amplitude V is connected in series with a capacitance C and an electric bulb of resistance R (zero inductance). When ω is increased, what happens to the brightness of the bulb?

An inductor of reactance 1 Ω and a resistor of 2 Ω are connected in series to the terminals of a 6 V (rms) AC source. The power dissipated in the circuit is: