1. PHYS-1700/2100PHYS-1700/2100 Course Introduction And Electric ChargeNEBRASKA WESLEYAN UNIVERSITYSPRING 2014-2015 DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD of 10 1 [Insert puzzler here]

2. PHYS-1700/2100PHYS-1700/2100 Course Introduction And Electric ChargeNEBRASKA WESLEYAN UNIVERSITYSPRING 2014-2015 DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD of 10 2 Announcements: Take any remote, enter 6-digit student ID. Log onto MasteringPhysics ASAP and make sure you can see assignments. First assignment due Friday 7:30 am.

3. PHYS-1700/2100PHYS-1700/2100 Course Introduction And Electric ChargeNEBRASKA WESLEYAN UNIVERSITYSPRING 2014-2015 DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD of 10 3 1 of 3 Lightweight conductive sphere A hangs by a string and is free to swing like a pendulum. Identical conductive sphere B is fixed by an insulating rod. Both are initially electrically neutral. An amount Q of positive charge is then transferred from B to A (leaving B with an amount Q of negative charge). When A is brought close to B, 1.A swings toward B (as shown). 2.A swings away from B (not shown). 3.A hangs straight down (not shown, no interaction). B A +Q −Q−Q + + + + −− − − + + + + −− −−

4. PHYS-1700/2100PHYS-1700/2100 Course Introduction And Electric ChargeNEBRASKA WESLEYAN UNIVERSITYSPRING 2014-2015 DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD of 10 4 2 of 3 Lightweight conductive sphere A hangs by a string and is free to swing like a pendulum. Identical conductive sphere B is fixed by an insulating rod. Both are initially electrically neutral. An amount Q of positive charge is placed upon A. When A is brought close to B, 1.A swings toward B (as shown). 2.A swings away from B (not shown). 3.A hangs straight down (not shown, no interaction). B A +Q + + + + + + + +

5. PHYS-1700/2100PHYS-1700/2100 Course Introduction And Electric ChargeNEBRASKA WESLEYAN UNIVERSITYSPRING 2014-2015 DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD of 10 5 3 of 3 Lightweight conductive sphere A hangs by a string and is free to swing like a pendulum. Identical conductive sphere B is fixed by an insulating rod. Both are initially electrically neutral. An amount Q of positive charge is placed upon A. B is grounded. When A is brought close to B, 1.A swings toward B (as shown). 2.A swings away from B (not shown). 3.A hangs straight down (not shown, no interaction). B A +Q + + + + + + + +

6. PHYS-1700/2100PHYS-1700/2100 Course Introduction And Electric ChargeNEBRASKA WESLEYAN UNIVERSITYSPRING 2014-2015 DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD of 10 6 Announcements: Take any remote, enter 6-digit student ID. Log onto MasteringPhysics ASAP and make sure you can see assignments. First assignment due Friday 7:30 am.

7. PHYS-1700/2100PHYS-1700/2100 Course Introduction And Electric ChargeNEBRASKA WESLEYAN UNIVERSITYSPRING 2014-2015 DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD of 10 7 TRIBOELECTRIC SERIES

8. PHYS-1700/2100PHYS-1700/2100 Course Introduction And Electric ChargeNEBRASKA WESLEYAN UNIVERSITYSPRING 2014-2015 DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD of 10 8 1 of 3 Lightweight conductive sphere A hangs by a string and is free to swing like a pendulum. Identical conductive sphere B is fixed by an insulating rod. Both are initially electrically neutral. An amount Q of positive charge is then transferred from B to A (leaving B with an amount Q of negative charge). When A is brought close to B, 1.A swings toward B (as shown). 2.A swings away from B (not shown). 3.A hangs straight down (not shown, no interaction). B A +Q −Q−Q + + + + −− − − + + + + −− −−

9. PHYS-1700/2100PHYS-1700/2100 Course Introduction And Electric ChargeNEBRASKA WESLEYAN UNIVERSITYSPRING 2014-2015 DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD of 10 9 2 of 3 Lightweight conductive sphere A hangs by a string and is free to swing like a pendulum. Identical conductive sphere B is fixed by an insulating rod. Both are initially electrically neutral. An amount Q of positive charge is placed upon A. When A is brought close to B, 1.A swings toward B (as shown). 2.A swings away from B (not shown). 3.A hangs straight down (not shown, no interaction). B A +Q + + + + + + + +

10. PHYS-1700/2100PHYS-1700/2100 Course Introduction And Electric ChargeNEBRASKA WESLEYAN UNIVERSITYSPRING 2014-2015 DEAN SIEGLAFF NATHANIEL CUNNINGHAM BOB FAIRCHILD of 10 10 3 of 3 Lightweight conductive sphere A hangs by a string and is free to swing like a pendulum. Identical conductive sphere B is fixed by an insulating rod. Both are initially electrically neutral. An amount Q of positive charge is placed upon A. B is grounded. When A is brought close to B, 1.A swings toward B (as shown). 2.A swings away from B (not shown). 3.A hangs straight down (not shown, no interaction). B A +Q + + + + + + + +