An alternating voltge is represented by V = 80 sin (100π t) cos (100π t) volt. The peak voltage is (a) 20 V (b) 40 V (c) 30 V (d) 50 V

Answer: (b). Use 2sin θcos θ = sin 2θ. V = 40 × 2sin (100π t)cos (100π t) = 40sin (200π t) Peak voltage = 40 V So the answer is (b) 40 V.

An alternating voltge is represented by V = 80 sin (100π t) cos (100π… | MHT CET 2021 (21 Sep, Shift 1)

Q30MHT CET 2021 · 21 SEP · SHIFT 1Easy

AC Basics: Peak, RMS & Average Values

An alternating voltge is represented by $V = 80 \sin(100\pi t) \cos(100\pi t)$ volt. The peak voltage is

Show answer and solution

Answer: (b)

An AC source rated 220 V, 50 Hz is connected to a resistor. The time taken by the current…JEE Main 2021 (18 Mar, Shift 1)
An alternating e.m.f. is e = e₀ sin ω t. In what time the e.m.f. will have half its…MHT CET 2021 (24 Sep, Shift 2)
The instantaneous value of an alternating current is given by i = 50 sin (100π t). It…MHT CET 2021 (21 Sep, Shift 2)
A 10 Ω resistance is connected across 220V - 50 Hz AC supply. The time taken by the…JEE Main 2021 (25 Jul, Shift 2)
An AC current is given by I = I1 sin ω t + I2 cos ω t. A hot wire ammeter will give a…JEE Main 2021 (17 Mar, Shift 1)
An alternating current is given by the equation i = i1 sin ω t + i2 cos ω t. The rms…JEE Main 2021 (26 Feb, Shift 1)
The alternating current is given by i = √(42) sin (2π/T t) + 10 A The r.m.s. value of of…JEE Main 2021 (27 Aug, Shift 1)
An alternating voltage is given by E = 100 sin (ω t + π/6) V. The voltage will be maximum…MHT CET 2019 (2 May, Shift 2)