P24_007 - 7. (a) Let A = (1.40 m)2 . Then = (3.00y (A |y=0...

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7 .( a )L e t A =(1 . 40 m) 2 .Th en Φ=( 3 . 00 y ˆ j) · ( A ˆ j) | y =0 +(3 . 00 y ˆ j) · ( A ˆ j) | y =1 . 40 =( 3 . 00)(1 . 40)(1 . 40) 2 =8 . 23 N · m 2 / C . (b) The electric feld can be re-written as ~ E =3 . 00 y ˆ j+ ~ E 0 , where ~ E 0 = 4 . 00 ˆ i+6
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