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The problems are all online, so I can check relatively quicklyif the answer is r

ID: 1737273 • Letter: T

Question

The problems are all online, so I can check relatively quicklyif the answer is right/wrong. These problems are all seperate fromeach other unless they are posted in the same picture, and thanksin advance for the help!
http://img89.imageshack.us/my.php?image=physics3dh7.jpg http://img8.imageshack.us/my.php?image=physics5fd0.jpg http://img89.imageshack.us/my.php?image=physics4en9.jpg The problems are all online, so I can check relatively quicklyif the answer is right/wrong. These problems are all seperate fromeach other unless they are posted in the same picture, and thanksin advance for the help!
http://img89.imageshack.us/my.php?image=physics3dh7.jpg http://img89.imageshack.us/my.php?image=physics4en9.jpg

Explanation / Answer

021 The other point is between D and 2D k(-2Q)/(d - D) + kQ/(2D - d) = 0 2/(d - D) = 1/(2D - d) 2(2D - d) = d - D 4D - 2d = d - D so d = 5D/3 answer: 3. 5D/3