<p>(a) Find the time required for a 60 Hz alternating current to reach its peak value starting from zero.</p>

<p>(b) What is meant by the statement that the current through an inductor lags behind the emf across it by&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">&#960;</mi><mo>/</mo><mn>2</mn></math>?</p>