Final Exam Practice questions - Introductory Physics | PHYSICS 8B, Exams of Physics

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FROM : Fax NO. : May. 13 2802 81:38PM PL Physics 8B Spring 2002 PRACTICE FINAL EXAM Note: On the actual exam you will be given values of physical constants. Zoe fs 1. In the diagram, g, = 1.0 WC, g. = 2.0 uC, and g, =-3.0 pC. . Charge g, has a mass of 0,10 kg. All the charges are initially stationary. Suppose someone comes along and wants to | 1Oem knock q, away from the other charges (i.e., he wants to send q, i off to infinity), What minimum speed does he need to give g, a, to make that possible? 2, In the diagram below, C, = 1.0 UF, C, = 2.0 UF, C; = 3.0 uF, and C,=4.0 uF. Find the charge and the potential difference across each of the capacitors. = Fov 3. A square loop of wire 0,50 m on a side with a Ix KE tesistance of 50.0 Q is entering a region which ye A has a uniform magnetic field of 0.40 T, as tale et shown here, The field is directed into the page, aa Vales but at an angle of 30° to the plane of the loop. Se ! The loop is moving at a speed of 1.50 m/s, ié aK (a) What is the current in the loop as it enters | the ficld? (b) Does the current flow clockwise ; or counterclockwise? 3e¢ —> — sy, R 4. A wire carrying a current of 1.50 mA is connected to a 6.0 LF capacitor consisting of two parallel circular plates spaced 5.0 mm apart, so that the capacitor is f Side urew Lor & 3) being charged up. (a) Find the rate of change of the electric field dH/dt between the capacitor plates. “ (b) Find the following ratio: The magnetic field inside the capacitor, at a distance from the center of . 1/3 the radius of the plates; divided by the field C ‘ outside the capacitor, at a distance of 3 times the radius of the plates.