Transcript Slide 1
PHYS-1700/2100 III7 Faraday’s and Lenz’s Laws NEBRASKA WESLEYAN UNIVERSITY SPRING 2014-2015 [Insert puzzler here] DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD 1 of 9 PHYS-1700/2100 III7 Faraday’s and Lenz’s Laws NEBRASKA WESLEYAN UNIVERSITY SPRING 2014-2015 AGENDA ITEM Introductory Concept Survey (Individual) Rectangular Loop Falling Into a Region of Uniform B (Analysis) Flux-linked Solenoids (Analysis) Demonstration of Persistent Induced Current (Superconductor) Concept Survey Re-vote (Group Discussion) Dismissal DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD DURATION START 0:10 0:30 0:40 0:15 0:10 0:00 0:10 0:40 1:20 1:35 1:45 2 of 9 PHYS-1700/2100 III7 Faraday’s and Lenz’s Laws NEBRASKA WESLEYAN UNIVERSITY A bar magnet approaches a multi-turn coil. If a current is induced to flow in the coil, it will pass through the sensing resistor shown. In which direction will current flow in the resistor? 1. 2. 3. SPRING 2014-2015 1 of 3 To the right. To the left. No current will flow in this case. N DEAN SIEGLAFF NATHANIEL CUNNINGHAM S BOB FAIRCHILD 3 of 9 PHYS-1700/2100 III7 Faraday’s and Lenz’s Laws NEBRASKA WESLEYAN UNIVERSITY SPRING 2014-2015 A rectangular loop of wire is dropped into a region of uniform magnetic field. If a current flow is induced in the loop, in which direction will the current flow in the bottom edge of the loop? 1. 2. 3. 2 of 3 To the right. To the left. No current will flow in this case. v B DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD 4 of 9 PHYS-1700/2100 III7 Faraday’s and Lenz’s Laws NEBRASKA WESLEYAN UNIVERSITY SPRING 2014-2015 Two solenoids A and B are “flux linked” by an iron core. A constant current is driven into A, in the sense shown. If a current is induced in B, in which direction will it flow through the sensing resistor? 1. 2. 3. 3 of 3 To the right. To the left. No current will flow in this case. B A R i a DEAN SIEGLAFF NATHANIEL CUNNINGHAM end view BOB FAIRCHILD i b 5 of 9 PHYS-1700/2100 III7 Faraday’s and Lenz’s Laws NEBRASKA WESLEYAN UNIVERSITY SPRING 2014-2015 AGENDA ITEM Introductory Concept Survey (Individual) Rectangular Loop Falling Into a Region of Uniform B (Analysis) Flux-linked Solenoids (Analysis) Demonstration of Persistent Induced Current (Superconductor) Concept Survey Re-vote (Group Discussion) Dismissal DURATION START 0:10 0:30 0:40 0:15 0:10 0:00 0:10 0:40 1:20 1:35 1:45 Video of magnetically levitation superconductor: https://www.youtube.com/watch?v=zPqEEZa2Gis&feature=em-share_video_user DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD 6 of 9 PHYS-1700/2100 III7 Faraday’s and Lenz’s Laws NEBRASKA WESLEYAN UNIVERSITY A bar magnet approaches a multi-turn coil. If a current is induced to flow in the coil, it will pass through the sensing resistor shown. In which direction will current flow in the resistor? 1. 2. 3. SPRING 2014-2015 1 of 3 To the right. To the left. No current will flow in this case. N DEAN SIEGLAFF NATHANIEL CUNNINGHAM S BOB FAIRCHILD 7 of 9 PHYS-1700/2100 III7 Faraday’s and Lenz’s Laws NEBRASKA WESLEYAN UNIVERSITY SPRING 2014-2015 A rectangular loop of wire is dropped into a region of uniform magnetic field. If a current flow is induced in the loop, in which direction will the current flow in the bottom edge of the loop? 1. 2. 3. 2 of 3 To the right. To the left. No current will flow in this case. v B DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD 8 of 9 PHYS-1700/2100 III7 Faraday’s and Lenz’s Laws NEBRASKA WESLEYAN UNIVERSITY SPRING 2014-2015 Two solenoids A and B are “flux linked” by an iron core. A constant current is driven into A, in the sense shown. If a current is induced in B, in which direction will it flow through the sensing resistor? 1. 2. 3. 3 of 3 To the right. To the left. No current will flow in this case. B A R i a DEAN SIEGLAFF NATHANIEL CUNNINGHAM end view BOB FAIRCHILD i b 9 of 9 PHYS-1700/2100 III7 Faraday’s and Lenz’s Laws NEBRASKA WESLEYAN UNIVERSITY SPRING 2014-2015 PROJECTION SCREEN 1 4 1 4 1 4 1 4 2 5 2 5 2 5 2 5 3 6 3 6 3 6 3 6 HAND IN TODAY’S ACTIVITIES SHEETS DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD 10 of 9