Question Detail
Question
v = 290 sin ωt, ω=1256 rad/s. RMS and instantaneous at t=0.5s, period?
Correct Answer
Option A is the correct answer.
Detailed Explanation
V_rms = 290/1.414 ≈ 205 V. ωt=1256×0.5=628 rad, sin(628)≈ -1, so v≈ -290V. T=2π/ω=2π/1256≈0.005 s=5 ms.
Hint
T = 2π/ω.