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Magnetism (part 2)

# Magnetism (part 2) - Lecture 02 Chapter 32 F x B F = AI = B...

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Physics 113, Dr. Renat Letfullin 1 Lecture 02: Chapter 32 B x . F F θ θ μ B U - = μ B × = μ τ AI = μ

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Physics 113, Dr. Renat Letfullin 2 Today.. . Biot-Savart Law Ampere’s Experiment Magnetic Force Movie: Magnetism S N
Physics 113, Dr. Renat Letfullin 3 Cross Product Form of the Biot-Savart Law ( 29 0 2 ˆ 4 q v r B r μ π × = The Biot-Savart Law can be represented more compactly using a vector cross product. This automatically gives a B field that is perpendicular to the plane of the charge velocity and radius vector to the point at which the field is being evaluated. Note that the r in the numerator is r (unit vector), not r (vector)! ^

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Physics 113, Dr. Renat Letfullin 4 Question : The positive charge is moving straight out of the page. What is the magnetic field at the position of the dot? a) Up. b) Down. c) Left d) Right. e) Out of the page.
Physics 113, Dr. Renat Letfullin 5 Example : The Magnetic Field of an Electron An electron is moving to the right, as shown in the diagram.

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