problem21_45

# University Physics with Modern Physics with Mastering Physics (11th Edition)

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21.45: a) At the origin, . 0 = E b) At : 0 , m 3 . 0 = = y x . C N ˆ 2667 ˆ ) m 45 . 0 ( 1 ) m 15 . 0 ( 1 ) C 10 00 . 6 ( 4 1 2 2 9 0 i i E = + × = - πε c) At : m 4 . 0 m, 15 . 0 - = = y x - + - × = - j i j E ˆ 5 . 0 4 . 0 ) m 5 . 0 ( 1 ˆ 5 . 0 3 . 0 ) m 5 . 0 ( 1 ˆ ) m 4 . 0 ( 1 ) C 10 00 . 6 ( 4 1 2 2 2 9 0 πε C N 5 . 526 C N ) ˆ 3 . 510 ˆ 6 . 129 ( = - = E j i E and 7 . 75 = θ down from the x -axis. d) C N ˆ 1382
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