The equation of stationary wave on a string clamped at both ends and vibrating in third harmonic is Y = 0.5 sin (0.314.x) cos(600πt) where x and y are in cm, t in second. The length of the vibrating string is

Question:

Options :

(a) 40 cm
(b) 30 cm
(c) 10 cm
(d) 20 cm

Answer :

(b) 30 cm

Answer Steps :

step 1

step 2

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An alternating voltage source is connected in series with a resistance R and an inductance L. If the potential drop across the resistance is 200 V and across the inductance is 150 V, then the applied voltage is:

In an a. c. circuit the instantaneous current and e.m.f. are represented as: I = I0 sin(ωt – π/6) and E = E0 sin(ωt + π /3) respectively. The voltage leads the current by

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