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Unformatted text preview: 61. (a) We seek the electrostatic ﬁeld established by the separation of charges (brought on by the magnetic
force). We use the ideas discussed in §29-4; especially, see SAMPLE PROBLEM 29-2. With Eq. 2910, we deﬁne the magnitude of the electric ﬁeld as |E | = v |B | = (20)(0.03) = 0.6 V/m. Its direction
may be inferred from Figure 29-8; its direction is opposite to that deﬁned by v × B . In summary,
E = −0.600 V/m k
which insures that F = q (E + v × B ) vanishes.
(b) Eq. 29-9 yields V = (0.6 V/m)(2 m) = 1.20 V. ...
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