<p>The equation of a.c in a circuit is I = 50 sin 100<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#960;t</mi></math>. Find (i) frequency of a.c. (ii) mean value of a.c over positive half cycle. (iii) rms value of current and (iv) the vlaue of current 1/300 second after it was zero.</p>