Problem

When an alternating voltage of 220 V is applied across a device

P

, a current of 0.25 A flows through the circuit and it leads the applied voltage by an angle

\pi/2

radian. When the same voltage source is connected across another device

Q

, the same current is observed in the circuit but in phase with the applied voltage. What is the current when the same source is connected across a series combination of

P

and

Q

? (a)

\frac{1}{4\sqrt{2}}

A lagging in phase by

\pi/4

with voltage (b)

\frac{1}{4\sqrt{2}}

A leading in phase by

\pi/4

with voltage (c)

\frac{1}{\sqrt{2}}

A leading in phase by

\pi/4

with voltage (d)

\frac{1}{4\sqrt{2}}

A leading in phase by

\pi/2

with voltage

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