# 25 RL - Summary of Lecture 24 Mutual induction two coils...

This preview shows pages 1–5. Sign up to view the full content.

Craig Ogilvie 11 Summary of Lecture 24 § Mutual induction two coils change current in one, changes flux in other => induce emf magnitude of emf given by ε2 = - M di1/dt M is mutual inductance, solely depends on geometry § Single solenoid/coil, inductor change current in a coil, B-field changes, flux changes » emf induced, ε = - L di/dt » always acts to oppose change » visual, imagine temporary “battery” at place of inductor

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

View Full Document
Craig Ogilvie 22 Goals For Today § Calculate inductance, L § Use of inductors in circuits
Craig Ogilvie 33 Question: Inductor emf, 1st round § In the circuit shown, the voltage in the power supply is turned down, so that the current decreases § During this operation which point, y or z, is at a lower potential 1. y lower potential 2. z lower potential 3. Both at the same potential Hint: figure out how to oppose change 1 of 300

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

View Full Document
Craig Ogilvie 44 Question: Inductor emf, 2nd round 0% 100% 0% 0% 100% 0% 1 2 3 § In the circuit shown, the voltage in the power supply is turned down, so that the current decreases § During this operation which point, y or z, is at a lower potential Hint: figure out how to oppose change By Lenz law induced emf tries to oppose change. Current is decreasing so emf tries to increase it.
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 09/20/2011 for the course PHYS 222 taught by Professor Johnson during the Spring '07 term at Iowa State.

### Page1 / 18

25 RL - Summary of Lecture 24 Mutual induction two coils...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online