Chapter 30c

# Chapter 30c - Exam 2 Question 15 Hall Effect i E z y The...

This preview shows pages 1–6. Sign up to view the full content.

Exam 2 Question 15 – Hall Effect i The electric current is going up (+z), which by convention means that this is the direction of e movement of the positive charges. the movement of the positive charges. However, we know that in a metal the charges that move are the conduction electrons, with a rift velocity the opposite direction ( z + + + - - - E e F q E   drift velocity d in the opposite direction (-z). B F x y + + - - - d - E F Ee BE FF   + + - Be d Fq B  Ch. 30: Induction and Inductance - Part C 1 October 28, 2009 B is into the page (-x) direction! Exam results: 30% (-i), 40% (+i), 30% (+,-j)

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

View Full Document
Chapter 30: Induction and Inductance Review of induction, inductors and inductance. HITT question. Self-induction. RL circuits. Energy stored in the magnetic field. nergy density of a magnetic field. Energy density of a magnetic field. Mutual induction – read the textbook. quivalent inductance of inductors connected Equivalent inductance of inductors connected in series and in parallel – added without proof. Ch. 30: Induction and Inductance - Part C 2 October 28, 2009
Faraday’s Law of Induction An emf is induced when the magnetic field flux changes with time, its value equal to the rate at hich the magnetic field flux changes with time : B d - induced emf - agnetic field flux which the magnetic field flux changes with time : raday’s o Ed s N dt  B magnetic field flux - number of turns N Faraday s law E - induced electric field B BdA   Magnetic flux. Surface defined by a conducting loop. a vector of magnitude A nd direction of the A Ch. 30: Induction and Inductance - Part C 3 October 28, 2009 is a vector of magnitude dA and direction of the area normal. dA

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

View Full Document
Faraday’s Law and Lenz’s Law Use Faraday’s law to get the magnitude of the induced emf. B d N dt Use Lenz’s law to get the direction of the induced mf and current emf and current. B d The minus sign symbolizes N dt Lenz’s law. he induced emf opposes the magnetic flux change! Ch. 30: Induction and Inductance - Part C 4 October 28, 2009 The induced emf opposes the magnetic flux change!
Inductors and Inductance An inductor (usually a solenoid) is used to produce a desired magnetic field. he inductance f the inductor (solenoid) is: The inductance L of the inductor (solenoid) is: B N - current i - agnetic flux L i B magnetic flux - number of turns N the magnetic flux linkage B N is the magnetic flux linkage

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 20

Chapter 30c - Exam 2 Question 15 Hall Effect i E z y The...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online