Questions 18-20 A rectangular conductive loop is placed near a long, straight wire at a distance a carrying an alternating current of I(t) = Io sin(ot). Here, o = 2/T , T = 0.02 s is the period of the alternating current. Both the wire and the loop are in the same plane. The side lengths of the loop are L1 = a and L2 = 2a, and the resistance R = 20 is connected between the two open ends of the loop (take ln2 = 0.6 and = 3). 18. What is the magnetic flux, in terms of o, Io and a, passing through the loop at t = T /4? (a) 10aoIo (b) 0.1aoIo (c) 2aoIo (d) 0.2aoIo (e) 3aoIo