Phy 121 - Sample Ex3b

Phy 121 - Sample Ex3b - Phys 121 Exam 3 Makeup spring 2008...

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Unformatted text preview: Phys 121 Exam 3 Makeup spring 2008 Name______________________________________________Sect___________ 1. For the RC circuit shown ( R = 2M Ω , C = 3 μ F and Ε = 300 V) how long will take for the current to reach value of 77 μ A after the switch is closed? A. 1 s B. 2 s C. 3 s D. 4 s E. 5 s 2. An electron moving with a speed of 2x10 5 m/s enters a region between two parallel plates separated by d = 20 mm with a potential difference of V = 100 V between them. The electron is moving perpendicular to the electric field of the plates when it enters the region between the plates. What uniform magnetic field , perpendicular to both the electron path and the electric field, must be applied for the electron not be deflected? A. 10 mT B. 15 mT C. 20 mT D. 25 mT E. 30 mT 3 – 4. Two long, straight wires are parallel and carry the same current of i 1 = i 2 = 6 A in the opposite direction as shown. 3. If the distance between the wires is 6 cm, and the distance from wire 1 to point B is 2 cm what are the direction and the magnitude of the net magnetic field at point B seen in figure. and the magnitude of the net magnetic field at point B seen in figure....
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Phy 121 - Sample Ex3b - Phys 121 Exam 3 Makeup spring 2008...

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