Unformatted text preview: with a diagram as on page 306, but turned through 90 o so that B is in the vertical direction. 7. Down. 8. (a) mv = qBr. (b) The angular velocity ω = v/r = qB/m. This is the number of radians per second. The number of revolutions per second is ω /2 π = qB/2 π m, independent of v and r. (c) K = m 2 v 2 /2m = q 2 B 2 r 2 /2m = 1.92MeV. 9. (As marked, goes with Example 10) B = 0.125T. 10. (Goes with example 9.) If we assume that we can use the relation for the infinitely long solenoid, B = 0.314T. 11. (a) Φ = 0 at t = 0, and after rotating 180 o , Φ = 0.18Tm 2 at 90 o and 270 o . (b) Φ = Φ max sin θ , E =E max cos θ , with diagrams as on page 322, with T = 1/12 s....
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 Summer '08
 CROFT
 Physics, Angular velocity, Magnetic Field, distance r2

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