(10 pts) An electron moving with a speed of 3.6 x 10t m/s perpendicular to a uni
ID: 1770042 • Letter: #
Question
(10 pts) An electron moving with a speed of 3.6 x 10t m/s perpendicular to a uniform magnetic field of 0.83 T. Determine the force that it experiences. (e 1.6x1019 c) 5. 6. (10 pts) In a model AC generator, a 502 turn rectangular coil 8.0 cm by 30 cm rotates at 120 rev/min in a uniform magnetic field of 0.58 T (a) What is the maximum emf induced in the coil? (b) What is the instantaneous value of the emf in the coil at t-n/32) s? Assume that the emf is zero att o. (5 pts) What is the resistance of a lightbulb that uses an average power of 40.0 W wher connected to a 60.0-Hz power source having a maximum voltage of 170 V? 7.Explanation / Answer
5. F = q v B sin(theta)
F = 1.6 x 10^-19 x 3.6 x 10^4 0.83 sin90
F =4.78 x 10^-15 N
6. max EMF = N A B w
(w = 120 x 2 pi rad / 60 s = 12.6 rad/s)
= 502 x (0.08 x 0.300) (0.58) (12.6)
= 87.8 Volt
(b) Emf = 87.8 sin(wt) = 82.9 Volt
7. P = V^2 / R
R = 170^2 / 40 = 722.5 Ohm
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