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Q.

In an a.c. circuit V and I are given by
V =100 sin (100t) volt
I =100 sin (100t +π / 3) mA
The power dissipated in the circuit is

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a

104 watt

b

5.0 watt

c

10 watt

d

2.5 watt

answer is C.

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Detailed Solution

P=Vr.m.sx 1r.m.sx cos ϕ=12V010cos ϕ
=12100x(100x10-3)cos π/3=2.5W

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