Jasmine Mbonzo's Request (31 Aug 2017)

I need help calculating electrostatic forces and and fields due to point charges in various scenarios. For example: "A point charge of 10 µC is located at x = -3.0 cm, and a second point charge of -7 µC is located at x = +4.0 cm. Where should a third charge of +6.0 µC be placed so that the electric field at x = 0 is zero." I'm using the formula for an electric field E=k*q/r^2 and not getting answers correct at all.
PHYS 2212

submitted: Aug 31, 2017
responded: Sep 01, 2017
  • method: live
    requested time: Sep 01, 8:00 AM
1 Comment:
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  • Theo Tate (admin)
    Sept. 1, 2017, 3:44 p.m.

    The electric field that created by the 10uC and -7uC are both toward to the right at the origin, which at x = 0. Use the equation you have for the electric filed to calculated the value.( make sure you have the right distance for each electric filed). Since the third charge is positive charge, it should be located to the right side of x = 0 (which create the electric filed that toward left at x = 0,). Its value should equal to the sum of the first and second electric filed.

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