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A proton is moving north in a region where the magnetic field is west. The magnetic force exerted on the proton is: * {2 Points} 5 If the electric field is E at a distance d from a point charge, its magnitude will be 2E at a distance * (2 Points) O d/ v2 O v2 d O d/4 O d/27 Andrea pulls a 25 kg box horizontally from rest while exerting a constant horizontal force, displacing the box 3.0 m in 10 s. Neglecting friction, the force Andrea exerts on the box is approximately * (2 Points) 1.5 N 102 N 417 N 6N 8 30 20 1 . In the diagram, the current in the 3-0 resistor is 4A. The potential difference between points 1 and 2 is: * (2 Points) 0.8V 1.25V 12V O 20VA ZEDm length of copper wire has a resistance of 2.0 ohms. Its crosssectional area is * [2 Points} 0 1.? mm\"? C) 3.4 mm\"? O 0.001? mm\"? 0 5.3 mm\"? The circuit in the figure below contains a batteryr of emf U and four identical resistors connected as shown. Which of the following equations about the currents I1. l2 . I3. and I4 is CORRECT? * (2 Points) 0 Allthe above 0 l3 =I4 0 I2: I3+l4 O n =|2 12 Two people use ropes to pull identical sofas up to their neighboring 5th floor apartments. One pulls up the sofa graduallyr in 100 seconds. The other pulls theirs up quickly in 29 seconds. The power output and the work done of the quick puller compares to that of the slow puller as * [2 Points) 0 Work greater. Power greater 0 Work greater. Power same 0 Work same. Power same 0 Work same. Power greater A point charge of 9nC is on the xaxis at x = 4m. The electric eld is directed * [2 Points) 0 upward 0 toward left 0 toward right 0 downward