Wire is wound on a square frame, 30 cm by 30 cm, to form a coil of 7 turns. The frame is mounted on a horizontal shaft through its center (perpendicular to the plane of the diagram), as shown in the figure. The coil is in clockwise rotation, with a period of 0.060 s. A uniform, horizontal, magnetic field of magnitude 0.40 T is present. At a given instant, the plane of the coil forms a 60 angle with the horizontal, as shown. At that instant, what is the magnitude of the emf induced in the coil? 60 B = 0.40 T P 30 m 00 13 V 26 V 2.1 V 3.6 V 23 V As shown in the figure, a wire and a 10-2 resistor are used to form a circuit in the shape of a square, 20 cm by 20 cm. A uniform but nonsteady magnetic field is directed into the plane of the circuit. The magnitude of the magnetic field is decreased from 1.50 T to 0.50 T in a time interval of 63 ms. The average induced current and its direction through the resistor, in this time interval, are closest to 20 cm ww 10 63 mA, from b to a. O 38 mA, from b to a. O 38 mA, from a to b. 63 mA, from a to b. 95 mA, from a to b. 20 cm