Unformatted text preview: 64. The force associated with the magnetic ﬁeld must point in the ˆ direction in order to cancel the force of
gravity in the −ˆ direction. By the right-hand rule, B points in the −k direction (since ˆ × (−k) = ˆ
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,
k = −0.061k
B = Bz k = −
in SI units (Tesla). ...
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