Two Solutions - Students Here are the solutions for two...

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A E Q l l l Q B E A B Students – Here are the solutions for two problems from the text that relate to the topics that I have heard most asked about in discussions. 38. ( a ) The field due to the charge at A will point straight downward, and the field due to the charge at B will point along the line from A to the origin, 30 o below the negative x axis. AA A 22 o BB 2 o B AB 44 4 2 0 , 3 cos30 , 2 sin30 2 33 39 1 2 3 4 t xx x y xxx yyy xy QQ Ek E E k QQQ E k k k EE E k E k kQ E     ll l l l 2 11 1 1 o 2 3 3 2 an tan tan tan 3 240 2 y x Q k E E Q k   l l ( b ) Now reverse the direction of A E A oo B 2 2 2 0 , 3 cos30 , sin30 3 E E k Q Q E k k E k k E k E k l l l 4 2 34 4 E l l 2 1 o 2 1 2 tan tan tan 330 2 y x Q k E E Q k l l
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49. Select a differential element of the arc which makes an angle of with the x axis.
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Two Solutions - Students Here are the solutions for two...

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