Physics
posted by micole .
Two point charges lie on the x axis. A charge of + 6.5 µC is at the origin, and a charge of 1.5 µC is at x = 10.0 cm.
What is the net electric field at x = 2.0 cm?
I found the electrical field for each charge using the equation E= k(q)/ r^2. My calculations were:
For the first charge (8.99e9)(6.5e6)/(.2^2) = 1460875 and (8.99e9)(1.5e6)/(.2 + .1)^2 = 149833.33 for the second. I added the two to determine the net field 1610708.33N/C. This answer was incorrect. So then I used 1.5e6, recalculated and got net of 1311041.67; also incorrect. Can anyone tell me if I am I using the wrong equation or doing something else wrong?
You are doing something else wrong. The distance from charge 1 to the point where the field is desired is 0.02 m, not 0.2. Likewise for charge 2, it is 0.1 + 0.02m , not 0.1 + 0.2.
Respond to this Question
Similar Questions

physics check
1. three point charges, q1, q2, q3, lie along the xaxis at x = 0,3,5, respectively. Calculate the magnitude and direction of the net electric force on q1 if q1 = +6 x 10^6 C, q2 = +1.5 X 10^6 C and q3 = 2.0 x 10^6 C. my answre … 
why doesn't anybody ever help me.
1. three point charges, q1, q2, q3, lie along the xaxis at x = 0,3,5, respectively. Calculate the magnitude and direction of the net electric force on q1 if q1 = +6 x 10^6 C, q2 = +1.5 X 10^6 C and q3 = 2.0 x 10^6 C. my answre … 
physics
please check: Two point charges, initially 1 cm apart, are moved to a distance of 3 cm apart. By what factor do the resulting electric and gravitational forces between them change? 
Physics
Two charges are D = 1.5 m apart and lie on the xaxis. What must be the magnitude of the charge on the right one, Q2, (in C) so that the electric field is zero at x = 1.05 meters. Let Q1 be at the origin and have a charge 6 C. 
physics
Three point charges lie in a straight line along the yaxis. A charge of q1 = 9.20 µC is at y = 6.60 m, and a charge of q2 = 8.00 µC is at y = 3.90 m. The net electric force on the third point charge is zero. Where is this charge … 
physics
Three point charges lie in a straight line along the yaxis. A charge of q1 = 9.80 µC is at y = 6.00 m, and a charge of q2 = 8.20 µC is at y = 4.10 m. The net electric force on the third point charge is zero. Where is this charge … 
physics
Two point charges lie on the x axis. A charge of 6.2μC is at the origin, and a charge of 9.5μC is at x=10.0cm. What is the net electric field at (a) x=−4.0cm and at (b) x=+4.0cm? 
Physics
Three point charges lie in a straight line along the yaxis. A charge of q1 = 9.10 µC is at y = 6.70 m, and a charge of q2 = 7.70 µC is at y = 3.60 m. The net electric force on the third point charge is zero. Where is this charge … 
physics
Two point charges lie along the y axis. A charge of q1 = 12.0 µC is at y = 6.0 m, and a charge of q2 = 5.0 µC is at y = 3.0 m. Locate the point (other than infinity) at which the total electric field is zero. 
physics
Two point charges lie along the y axis. A charge of q1 = 12.0 µC is at y = 6.0 m, and a charge of q2 = 5.0 µC is at y = 3.0 m. Locate the point (other than infinity) at which the total electric field is zero.