ch28-p030 - 30. (a) Eq. 3-20 gives = cos1(2/19) = 84. (b)...

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30. (a) Eq. 3-20 gives φ = cos 1 (2/19) = 84 ° . (b) No, the magnetic field can only change the direction of motion of a free (unconstrained) particle, not its speed or its kinetic energy.
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