Question 3 1 pts What should be the minimum rotational angular speed in rad/s of a circular coil of radius, r, containing 360 turns to produce a maximum amplitude of emf 12 V in a uniform magnetic eld B tesla? Assume r = 25 cm and B = 1.8 tesla. Question 4 1 pts What is the value of induced current in amperes through the coil on a magnetic field strength B shown in the sketch when the coil completely slides out of the magnetic field in 0.18 seconds without changing the orientation of the coil? Assume resistance of the coil is 1.9 ohms, area of the coil is 1.3 x 10-2 m , and the B = 2.4 tesla? BQuestion 5 1 pts What is current in amperes owing in the secondary coil of an ideal step-down transformer when it is supplying 67 watts power to a device in US households where wall outlet has 120 V? Assume that the ratio of the turns in primary and secondary coil, Np/Ns is 11