Question

Physics Pre-Lab Magnetism and Induction Name: UserID (e.g. abc123): Pre-Lab Questions: 1. The figures below indicate currents running through a flat circular loop of wire that is nearly perpendicular to the plane of the page. In which of these figures will the magnetic field at the center of the loop point toward the bottom of the page? (The larger arrow is on the part of the loop closest to you.) 2. In the figures at right, a magnet is shown falling through a coil of wire. Which surface of the magnet is its North Pole? (i.e., Is the North pole the top surface or the bottom surface?) Clearly explain how you know. TT MAGNET MAY Figure 1 3. While this magnet is falling down toward the ring (Figure 1), will the current in this coil be clockwise, counterclockwise, or zero, as seen from above? Explain why, Figure 2 4. While the magnet is moving away from the ring (Figure 3), will the current in this coil be clockwise, counterclockwise, or zero, as seen from above? Explain why. Figure 3

Answer 1

Direction of magnetic field due to current carrying loop can be found using right hand rule. Stretch right hand fingers, then curl rest of the four fingers along the direction of current in the loop keeping the right thumb straight. The direction of right hand thumb will give the direction of the magnetic field.