The circular solenoid drawn to the right has a radthe circular solenoid drawn to the right has a radius r = 8cm. a square loop of wire with 1 turn and normal parallel to the axis of the solenoid is inside the solenoid. the length of one side of the square loop is ? = 4cm. the solenoid is wound with n = 175 turns of over a length 25cm. the solenoid is connected to a resistor and therefore the current in the solenoid is decreasing according to the function isol = i0e ? t/? where i0 = 0.25a and ? = 75s. the system is drawn to the right. the magnetic field in the solenoid points out of the page as drawn. calculate the emf around the square loop (dark square) at t = 0. select one of the following:
(a) |emf| = 1.1 × 10? 9v
(b) |emf| = 4.7 × 10? 9v
(c) |emf| = 3.5 × 10? 7v
(d) |emf| = 8.8 × 10? 6v
(e) |emf| = 1.2 × 10? 5v