PHS 212 Final, Spring 2002

NDU PHS 212 - Electricity & Magnetism Faculty of Natural and Applied Sciences Final Exam - Spring 2002 Department of Sciences Duration: 2 hours Instructor: Dr. Roger Hajjar Solve all problems triangle such that bvo of x axis), the third is on the z ,2} im space. Find the electric 1, Three identical charges g are placed on the summit ofan equils Pie charges are Jocared at (—a,0,0) and [a ,0,0} ¢ axis at (0,0,a¥3) . Find the porentia int field E (vector) at point P. 2. An infinite trough 2 cisseibuted over the¢ross- ireuit oscillates with a frequency of 74 Hz, it is found that a iS equal to 3.5 mA while the charg. on the capacitor is 93 uC . Aspherica) capacitor carries 6 charge of 156 uC. Its inner radius is: 6.12 om, pe inser space is t on wit tk a dielectric having 4 const 6. Por the same situation as problem 5, Fine the leclgaeen r resislivity is p=1. 2x 10°O ow 3 7. Caleulate the different equivalent capacit ed ftom three identical 3uP-capaciters, Dre a diagram for each peels 3) Fart the 9. A Toroidal inductor with a square cross-section of inner radius 10 cm and outer radius 11 em has 1000 loops. The toroid is carrying a current of SA. What is the fraction of the tatal energy that is found between the 10 and 10.5 em radii. 10,(Bonus)Determine the currents at A, B and C, What is the power output of each battery? L5V Lov leet Hy=47rx 10 = e=162xK10™%C