P202_Ch20_HWa

# P202_Ch20_HWa - P202 spring 2006 Chapter 20 Electric...

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P202 spring 2006 Chapter 20: Electric Potential and Electric Potential Energy Homework due exactly at 11:59pm Jan. 22, 2006. All answer tolerance within 3% 1. A uniform electric field of magnitude of E=[ 5.5] ×10 3 N/C points in the positive x direction. Find the change in electric potential between the origin and the points (a) (0, 7.0m); (b) (7.0m, 0); and (c) (7.0m, 7.0m). Solution: (a) V 0 ) 7 0 0 10 5 . 5 ( ) ( 3 = × + × × = + = y E x E V y x (b) V 38500 ) 0 0 7 10 5 . 5 ( ) ( 3 = × + × × = + = y E x E V y x (c) V 38500 ) 7 0 7 10 5 . 5 ( ) ( 3 = × + × × = + = y E x E V y x 2. A point charge of q= [7.5] μC is at the origin. What is the electric potential at (a) (3.0m,0); (b) (-3.0m, 0); and (c) (3.0m, -3.0m)? Solution: (a) () ( ) 5 . 22 3 10 5 . 7 / 10 99 . 8 6 2 2 9 = × × = = m C C Nm r kq V V (b) () ( ) 5 . 22 3 10 5 . 7 / 10 99 . 8 6 2 2 9 = × × = = m C C Nm r kq V V (c) () ( ) 9

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P202_Ch20_HWa - P202 spring 2006 Chapter 20 Electric...

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