Lecture%2026%202220%20Spring%202009 - Reminders and...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Reminders and Announcements Exam 2 is this afternoon at 4:15 p.m. Chs. 27-30 HW 16 is due Friday. Help Room Hours (Physics 117): M 4-8 pm, T 3-6:30, W 3-6:30, R 4:30-8, F 2-6 Self-Inductance A self-induced emf is always proportional to the time rate of change of the current For a coil of N turns carrying current I: I L d εL dt II BL N ε L d dt RL Circuit, Analysis An RL circuit contains an inductor and a resistor When the switch is closed (at time t = 0), the current begins to increase At the same time, a back emf is induced in the inductor that opposes the original increasing current 0 I I d ε R L dt 1 I Rt L ε e R What is the effect of increasing the resistance in the preceding circuit? 0 of 5 1 2 3 4 25% 25% 25% 25% 1. Decreases time constant 2. Decreases maximum current 3. Increases time constant 4. Both 1 and 2 Energy in a Magnetic Field Part of the energy supplied by the battery appears as internal energy in the resistor The remaining energy is stored in the
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 09/30/2009.

Page1 / 3

Lecture%2026%202220%20Spring%202009 - Reminders and...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online