Unformatted text preview: end in (go into) – charges
• B field lines have no beginning or end
• No such thing as a “magnetic charge” has been found (called “magnetic monopole”). Magnets come with N and S poles together and a Npole or S
pole cannot be isolated.
• Notation: “X” denotes into the page, “•” denotes out of the page. 14 Cross Product Review
• Cross Product different from Dot Product
– A● is a scalar; A x B is a vector
B
– A● proportional to the component of B parallel to A
B – A x B proportional to the component of B perpendicular to A • Definition of A x B – Magnitude: ABsinθ
– Direction: perpendicular to plane defined by A and B with sense given by righthandrule 16 Remembering Directions: The Right Hand Rule r
rr
F = qv × B y x F B
qv 17 z P re flig h t 2
Three points are arranged in a uniform magnetic field. The B fie ld p o ints into th e s c re e n. 1) A positively charged particle is located at point A and is
stationary. The direction of the magnetic force on the particle is: r rr
F = qv × B
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 Spring '14
 Magnetic Force, Trigraph, constant magnetic field

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