_30. An electromagnet has a lifting force of 3.6 N. If the current through the coil is doubled and the number of coils is tripled, the lifting force will become a. 0.90N d. 14 N b. 1.8 N e. 22N c. 2.4N _31. To use the right hand rule to predict the direction of an induced current in a coil, your thumb must point a. To the N-pole of the induced magnetic field. b. To the S-pole of the induced magnetic field. c. In the direction of the induced current. d. In the direction of the inducing field. e. In the direction of the electron flow. _32. A ball is thrown vertically upward into the air. Which of the following acceleration-time graphs represents the ball's motion? A B C D E 3'5? \"5" ant out \"'5' r I' r 3' r a. A d. D b. B e. E c. C _33. A pilot ies to a destination due north from the departure point. During the ight there is a wind blowing from the west. What direction must the pilot point the plane during the ight? a. due east d. due west b. east of north e. west of north c. due north