Electr. and Magnetism

posted by .

1) A charge of 80nC is uniformly distributed along the x-axis from x= 0 to x= 2.0m. Determine the magnitude of the electric field at a point on the x-axis with x=8.0m.

a] 30 N/C
b] 15 N/C
c] 48 N/C
d] 90 N/C
e] 60 N/C


2) 3 point charges, 2 positive and one negative, each having a magnitude of 20uC are placed at the vertices of an equilateral triangle (30 cm on a side). What is the magnitude of the electrostatic force on one of the positive charges?

a]69N
b]40N
c]80N
d]57N
e]20N

  • Electr. and Magnetism -

    1. (b) is closest. You need to use Coulomb's law and integrate the effect of charge from x = 0 to 2, and include the factor epsilono

    2. When you use Coulomb's Law to add the vector electrostatic forces, the resultant will be parallel to the opposite side of the triangle.

    F = 2 *20uC* epsilon0*sin 30/(0.3)^2
    = (20 uC)^2*epsilono /0.09 m^2
    = 40 N

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics; Elect.

    1. A charge (uniform linear density=9.0 nC/m) is distributed along the x-axis from x=0 to x=3.0m. Determine the magnitude of the electric field at a point on the x axis with x=4.0m. a)81 N/C b)74 N/C c)61 N/C d)88 N/C e)20 N/C 2. A …
  2. physics

    A charge of 10.104 nC is uniformly distributed along the x-axis from −1 m to 1 m. What is the electric potential (relative to zero at infinity) of the point at 5 m on the x-axis?
  3. physics

    A charge of 10.104 nC is uniformly distributed along the x-axis from −1 m to 1 m. What is the electric potential (relative to zero at infinity) of the point at 5 m on the x-axis?
  4. Physics

    A thin rod L = 9.0 cm long is uniformly charged and has a total charge of 4.4 nC. Find the magnitude of the electric field at a point P located at a distance R = 13.5 cm from the center of the rod when: (a) The point P lies along the …
  5. Physics Help

    Charge is distributed uniformly along the x axis with density ßx and uniformly along the y axis with density ßy. Calculate the electric field at the points (a) r = a i + b j, and (b) r = c k.
  6. Physic Help

    Charge is uniformly distributed along the x axis with density ß. Use Gauss' Law to find the electric field it produces, and use this to calculate the work done on a charge Q that moves along the y axis from y = a to y = b.
  7. Physics

    A point charge Q1=-2 microcoulomb is located at x=0, and a point charge Q2=+8 microcoulomb, is placed at x=-0.5 on the x axis of a cartesian coordinate system.The goal of this problem is to determine the electric field,at various points …
  8. PHYSICS

    A rod 14.0 cm long is uniformly charged and has a total charge of -20.0 µC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 36.0 cm from its center. N/C
  9. PHYSICS

    A rod 14.0 cm long is uniformly charged and has a total charge of -20.0 µC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 36.0 cm from its center. N/C
  10. physics

    A rod 14.0 cm long is uniformly charged and has a total charge of -20.0 µC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 36.0 cm from its center. N/C

More Similar Questions