Square Left
December 28th, 2007
Square Left
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 Square Two Power Circle III Seven Iron Left Hand Golf Club Set NEW $59.99 Time Remaining: 29d 18h 28m Buy It Now for only: $59.99 |
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 SQUARE TWO ESSENCE Lady Flex Graphite Pitching Wedge Left Hand $16.19 Time Remaining: 13d 7h 48m Buy It Now for only: $16.19 |
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 LEFT HAND NIKE SQ MACHSPEED BLACK SQUARED STR8 FIT 105 DRIVER REGULAR EXCELLENT $69.98 Time Remaining: 17h 34m |
 Bobby Jones Golf Gap Wedge 52 w Original Square Grooves 4 Bounce Left Handed $67.45 Time Remaining: 12d 10h 48m Buy It Now for only: $67.45 |
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 Left Handed Nike SQ Dymo2 Squared Quad Keel 5 Fairway Wood UST SQ Dymo reg $34.99 Time Remaining: 1d 16h |
 LEFT LADIES HI LOFT 400cc SQUARE HEAD DRIVER GRAPHITE $39.95 Time Remaining: 29d 3h 17m Buy It Now for only: $39.95 |
 Nike SQ Machspeed Black Square Driver 105 Graphite Regular Left $136.49 Time Remaining: 25d 5h 22m Buy It Now for only: $136.49 |
 New Nike SQ Machspeed Black Square Driver 105 Steel Stiff Left $136.49 Time Remaining: 16d 20h 29m Buy It Now for only: $136.49 |
 LEFT HANDED SQUARE 3 5 7 FAIRWAY WOOD LH COMPONENT HEAD $73.14 Time Remaining: 9d 11h Buy It Now for only: $73.14 |
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 LEFT HAND NIKE GOLF SQ MACHSPEED BLACK SQUARED STR8 FIT 105 DRIVER SENIOR MINT $74.98 Time Remaining: 2d 19h 6m |
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 LEFT LADIES HI LOFT 400cc SQUARE HEAD DRIVER GRAPHITE $39.95 Time Remaining: 10d 10h 35m Buy It Now for only: $39.95 |
 Nike Golf Club Ladies Sumo 2 Square Hybrid Womens Rescue 3 Left Hand $59.99 Time Remaining: 16d 19h 46m Buy It Now for only: $59.99 |
 MENS LEFT HAND SQUARE HEAD 460cc DRIVER wGRAPHITE SHAFT $59.95 Time Remaining: 20d 10h 11m Buy It Now for only: $59.95 |
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 Left Hand Nike SQ MachSpeed Black Square Driver 105 Mint $69.99 Time Remaining: 3d 13h 17m Buy It Now for only: $89.99 |
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 LEFT HAND NIKE SQ MACHSPEED BLACK SQUARED STR8 FIT 105 DRIVER REGULAR MINT $124.99 Time Remaining: 19d 15h 16m Buy It Now for only: $124.99 |
 Nike SQ Machspeed Black Square Driver 105 Graphite Regular Left $136.49 Time Remaining: 4d 18h 18m Buy It Now for only: $136.49 |
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 LEFT HAND NIKE SQ MACHSPEED BLACK SQUARED STR8 FIT 95 DRIVER STIFF VERY GOOD $59.98 Time Remaining: 3d 18h 22m |
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 LEFT HAND NIKE SQ MACHSPEED BLACK SQUARED STR8 FIT 105 DRIVER SENIOR EXCELLENT $69.98 Time Remaining: 4d 19h 1m |
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 Left LH Beryllium Copper Lob Wedge 60 LW square grooves $99.99 Time Remaining: 5d 15h 14m Buy It Now for only: $99.99 |
 LH Left Beryllium Copper Sand Wedge 56 SW square groove $99.99 Time Remaining: 5d 15h 13m Buy It Now for only: $99.99 |
 Left LH TG Carbon Steel Wedge Set 56 60 Square Grooves $179.98 Time Remaining: 4d 12h 21m Buy It Now for only: $179.98 |
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A +2 uC charge and a -1 uC charge are fixed to the bottom left and bottom right corners of a square.?
A +2 uC charge and a -1 uC charge are fixed to the bottom left and bottom right corners of a square. What charge (magnitude and algebraic sign) would you need to place at the top left corner so that the total electric potential due to the three charges is 0V at the remaining corner?
Electric potential can be defined mathematically as
V = k q/r
where k is a constant equal to 1 / (4*pi*E), where E is the permittivity of free space.
We wish to place an unknown charge in the top left corner such that V = 0 in the top right corner.
To find this solution, we will invoke the superposition principle. The superposition principle says that the effective potential of a system of point charges is the algebraic sum of the potentials of each individual charge.
If the length of one side of the square is L, then the diagonal has length L (2)^0.5. Knowing this, we can calculate the effective electric potential at the top right corner due to the two known charges in terms of L. Knowing this value, we know that the third charge must produce a potential of equal magnitude and opposite sign in order to cancel out its effects. Since the distance between the top two corners is fixed, you only need to calculate the magnitude of the charge. Notice that the unknown length L ends up canceling out, so the fact that it's value is never given to us is not important.