Posted by SHUBHANGI on Wednesday, February 24, 2010 at 8:26pm.
Two point charges, 6.0 µC and 2.0 µC, are placed 6.0 cm apart on the x axis, such that the 2.0 µC charge is at x = 0 and the 6.0 µC charge is at x = 6.0 cm.
(a) At what point(s) along the x axis is the electric field zero? (If there is no point where E = 0 in a region, enter "0" in that box.)
x < 0 ___________
0 < x < 6.0 cm____________
6.0 cm < x____________
(b) At what point(s) along the x axis is the potential zero? Let V = 0 at r = . (If there is no point where V = 0 in a region, enter "0" in that box.)
x < 0 ____________
0 < x < 6.0 cm______________
6.0 cm < x________________

PHYSICS  bobpursley, Wednesday, February 24, 2010 at 8:43pm
so figure the E from each charge, and add them, set to zero, and solve.
It is obvious that between the charges, E will point to the left, and there is no solution there.
I will set up the problem for the x<0
E=0=2k/x^2 +6k/(absx+6)^2
2k/x^2=6k/(x+6)^2
take the sqrt of each side.
x=(abs x+6)/sqrt 3
absx *sqrt3absx=6
solve for x, remembering x is the distance from zero to the left.

PHYSICS  SHUBHANGI, Wednesday, February 24, 2010 at 8:45pm
I don't get it..
could u please explain it

PHYSICS  bobpursley, Wednesday, February 24, 2010 at 8:47pm
so figure the E from each charge, and add them, set to zero, and solve.
I am not going to do all that algebra for you. I will be happy to critique or check your work.
Answer This Question
Related Questions
 Physics  Two point charges, 5.0 µC and 2.0 µC, are placed 5.0 cm apart on the ...
 physics  Two point charges are placed on the x axis as follows: Charge q1= +4....
 Physics  Two point charges, 3.0 µC and 2.0 µC, are placed 4.8 cm apart on the ...
 physics  Two point charges +4q and +q are placed 30 cm apart. At what point on ...
 physics  Two point charges +4q and +q are placed 30 cm apart. At what point on ...
 SIMPLE pHYsics....  Two positive point charges are placed on the xaxis. One, ...
 Physics  Two positive point charges are placed on the xaxis. One, of magnitude...
 Physics  Two positive point charges are placed on the xaxis. One, of magnitude...
 Physics (Electricity & Magnetism))  Two positive point charges are placed on ...
 PHYSICS  Two point charges are placed on the x axis as follows: Charge q1= 4.20...
More Related Questions