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Lecture_13-1

# Lecture_13-1 - Lecture 13 1/18 Midterm Exam Thursday July...

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Lecture 13 1/18 Midterm Exam Thursday, July 7 th in class Closed book, closed notes Equation sheet will be provided Covers material from Chapter 21 Chapter 26 Covers homework from HW 1 HW 13 12 Questions, Multiple Choice

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Lecture 13 2/18 Magnetic Field B Magnetic force (F B ) acting on a moving charge depends on the magnitude of the charge (q) and the velocity (v) of the charge B v q F units of B is the tesla (T) 1 tesla (T) = 10 4 gauss (G) Magnetic field (B) is a vector and direction is given by Right Hand Rule Earth’s magnetic field at surface is about 0.5 gauss (G) (q>0) (q<0) (tesla) / ] ][ [ ] [ ] [ T m A N s m C N v q F B
Lecture 13 3/18 Hall Effect Flat conducting strip is placed in a circuit E along wire points in direction of decreasing potential B points into the page E What is the direction of the magnetic force on the moving charge? What happens to the negative charges? move to top of strip Assume current is made of negative charges (-q) moving in opposite direction as current (velocity to the left ) E H develops to E and B E H Lower edge has higher potential!

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Lecture 13 4/18 Hall Effect Flat conducting strip is placed in a circuit E along wire points in direction of decreasing potential B points into the page E What is the direction of the magnetic force on the moving charge? What happens to the positive charges? move to top of strip Assume current is made of positive charges (+q) moving in same direction as current (velocity to the right) E H develops to E and B E H Upper edge has higher potential!
Lecture 13 5/18 Carrier Sign from Hall Effect

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