#### Transcript Ch33 - Department of Physics

Chapter 33 A square conductor moves through a uniform magnetic field. Which of the figures shows the correct charge distribution on the conductor? 1) a 2) b 3) c 4) d 5) e A square conductor moves through a uniform magnetic field. Which of the figures shows the correct charge distribution on the conductor? 1) a 2) b 3) c 4) d 5) e Is there an induced current in this circuit? If so, what is its direction? 1. Yes, clockwise 2. Yes, counterclockwise 3. No Is there an induced current in this circuit? If so, what is its direction? 1. Yes, clockwise 2. Yes, counterclockwise 3. No A square loop of copper wire is pulled through a region of magnetic field. Rank in order, from strongest to weakest, the pulling forces F1, F2 , F3 , and F4 that must be applied to keep the loop moving at constant speed. 1. 2. 3. 4. 5. F2 = F4 > F1 = F3 F3 > F2 = F4 > F1 F3 > F4 > F2 > F1 F4 > F2 > F1 = F3 F4 > F3 > F2 > F1 A square loop of copper wire is pulled through a region of magnetic field. Rank in order, from strongest to weakest, the pulling forces F1, F2 , F3 , and F4 that must be applied to keep the loop moving at constant speed. 1. 2. 3. 4. 5. F2 = F4 > F1 = F3 F3 > F2 = F4 > F1 F3 > F4 > F2 > F1 F4 > F2 > F1 = F3 F4 > F3 > F2 > F1 A current-carrying wire is pulled away from a conducting loop in the direction shown. As the wire is moving, is there a cw current around the loop, a ccw current or no current? 1. There is a clockwise current around the loop. 2. There is a counterclockwise current around the loop. 3. There is no current around the loop. A current-carrying wire is pulled away from a conducting loop in the direction shown. As the wire is moving, is there a cw current around the loop, a ccw current or no current? 1. There is a clockwise current around the loop. 2. There is a counterclockwise current around the loop. 3. There is no current around the loop. A conducting loop is halfway into a magnetic field. Suppose the magnetic field begins to increase rapidly in strength. What happens to the loop? 1. The loop is pushed upward, toward the top of the page. 2. The loop is pushed downward, toward the bottom of the page. 3. The loop is pulled to the left, into the magnetic field. 4. The loop is pushed to the right, out of the magnetic field. 5. The tension is the wires increases but the loop does not move. A conducting loop is halfway into a magnetic field. Suppose the magnetic field begins to increase rapidly in strength. What happens to the loop? 1. The loop is pushed upward, toward the top of the page. 2. The loop is pushed downward, toward the bottom of the page. 3. The loop is pulled to the left, into the magnetic field. 4. The loop is pushed to the right, out of the magnetic field. 5. The tension is the wires increases but the loop does not move. The potential at a is higher than the potential at b. Which of the following statements about the inductor current I could be true? 1. 2. 3. 4. 5. I flows from a to b and is steady. I flows from a to b and is decreasing. I flows from b to a and is steady. I flows from b to a and is increasing. I flows from a to b and is increasing. The potential at a is higher than the potential at b. Which of the following statements about the inductor current I could be true? 1. 2. 3. 4. 5. I flows from a to b and is steady. I flows from a to b and is decreasing. I flows from b to a and is steady. I flows from b to a and is increasing. I flows from a to b and is increasing. Rank in order, from largest to smallest, the time constants of these three circuits. 1. 2. 3. 4. 5. τ1 > τ2 > τ3 τ2 > τ1 > τ3 τ2 > τ3 > τ1 τ3 > τ1 > τ2 τ3 > τ2 > τ1 Rank in order, from largest to smallest, the time constants of these three circuits. 1. τ1 > τ2 > τ3 2. τ2 > τ1 > τ3 3. τ2 > τ3 > τ1 4. τ3 > τ1 > τ2 5. τ3 > τ2 > τ1 Chapter 33 Reading Quiz Currents circulate in a piece of metal that is pulled through a magnetic field. What are these currents called? 1. Induced currents 2. Displacement currents 3. Faraday’s currents 4. Eddy currents 5. This topic is not covered in Chapter 33. Currents circulate in a piece of metal that is pulled through a magnetic field. What are these currents called? 1. Induced currents 2. Displacement currents 3. Faraday’s currents 4. Eddy currents 5. This topic is not covered in Chapter 33. Electromagnetic induction was discovered by 1. Faraday. 2. Henry. 3. Maxwell. 4. Both Faraday and Henry. 5. All three. Electromagnetic induction was discovered by 1. Faraday. 2. Henry. 3. Maxwell. 4. Both Faraday and Henry. 5. All three. The direction that an induced current flows in a circuit is given by 1. Faraday’s law. 2. Lenz’s law. 3. Henry’s law. 4. Hertz’s law. 5. Maxwell’s law. The direction that an induced current flows in a circuit is given by 1. Faraday’s law. 2. Lenz’s law. 3. Henry’s law. 4. Hertz’s law. 5. Maxwell’s law.