# Lecture 19-Wednesday March 11 Magnetic Forces on Moving Charges Mass Spectrometers.

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Lecture 19-Wednesday March 11 Magnetic Forces on Moving Charges Mass Spectrometers

Review of Monday Field of a long straight wire Field of a loop Field of a solenoid

Drawing Field Vectors and Field Lines of a Current-Carrying Wire Slide 24-21

Point P is 5 cm above the wire as you look straight down at it. In which direction is the magnetic field at P? 1.A 2.B 3.C 4.D 5.E

Checking Understanding A.10 A to the right. B.5 A to the right. C.2.5 A to the right. D.10 A to the left. E.5 A to the left. F.2.5 A to the left. The magnetic field at point P is zero. What are the magnitude and direction of the current in the lower wire? Slide 24-27

The Magnetic Field of a Current Loop Slide 24-23

The Magnetic Field of a Solenoid A short solenoidA long solenoid Slide 24-24

The Magnetic Field Inside a Solenoid Magnetic field inside a solenoid of length L with N turns. Slide 24-31

Quiz #7 What is the magnetic field strength and direction at point A? 10 A 2 cm A

The Force on a Charged Particle Moving in a Magnetic Field Slide 24-32

The Right-Hand Rule for Forces Slide 24-33

Slide 24-34

Paths of Charged Particles in Magnetic Fields Slide 24-35

Charged particle moving perpendicular to uniform magnetic field Magnetic force is perpendicular to velocity: What path if F ┴ v ?

The Mass Spectrometer Slide 24-36

Next Monday Read: 24: 6—Force on a current carrying wire Problems: 24: CQ10, MC33, 22, 25, 26, 29, 31, WB 24: 16-22

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