P29_064 - 64 The force associated with the magnetic field...

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Unformatted text preview: 64. The force associated with the magnetic field must point in the ˆ direction in order to cancel the force of j ˆ ˆ gravity in the −ˆ direction. By the right-hand rule, B points in the −k direction (since ˆ × (−k) = ˆ j i j). Note that the charge is positive; also note that we need to assume By = 0. The magnitude |Bz | is given by Eq. 29-3 (with φ = 90◦ ). Therefore, with m = 10 × 10−3 kg, v = 2.0 × 104 m/s and q = 80 × 10−6 C, we find mg ˆ ˆ ˆ k = −0.061k B = Bz k = − qv in SI units (Tesla). ...
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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