Point charge A is on the r-axis at r = -3.00 cm. At x = 1.00 cm on the x-axis its electric field is 2700 N/C Point charge B is also on the r-axis, at z = 5.00 cm The absolute magnitude of charge B is twice that of A. Find the magnitude and direction of the total electric field at the origin if A is positive and B is negative. Express your answer in newtons per coulomb. Enter positive value if the field points in +r-direction and negative value if the field points in -z-direction. E,= 8300 N/C Previous Answers v Correct • Part D Find the magnitude and direction of the total electric field at the origin if A is negative and B is positive. Express your answer in newtons per coulomb. Enter positive value if the field points in +z-direction and negative value if the field points in -r-direction. ? E, = N/C

A line of charge runs parallel to a sheet of charge, separated by a distance d = 28 cm. If the charge density of the line of charge is λ = 15 x 10-6 c/m and the charge density of the sheet of charge is o = 12 x 10-6 c/m², find the magnitude of the electric field at the midpoint between them. x 106 N/C E =

A long silver rod of radius 3.0 cm has a charge of 5 microcoulombs per meter on its surface. Find the magnitude of the electric field at a point 5.0 cm from the center of the rod (an outside point). Round to 2 significant figures. what is the electric field at a point 2 cm from the central axis of the rod

2 narrow, flat metal plates are positioned vertically, 20.00 cm. The first plate has a positive charge with charge density σ=+630.0 mC/m2 and a second plate has an equal but opposite negative charge with charge density σ=-6300.0 mC/m2 . There are also two narrow, flat metal plates positioned horizontally, 30.00 cm apart, with the top plate given a negative charge, and the bottom plate given an equal but opposite positive charge, such that the electric potential of the bottom plate is 5.00 V higher than the top plate. A small sphere with a mass of m =64.35 g, and a charge of q =22.00 mC is attached to a narrow, stiff, massless, insulating rod with a length of L= 8.00 cm, which is pivoted at point O, which is 2.000 cm from the second plate. The sphere/rod unit is angled at 5 degrees with horizontal and released from rest. Will the sphere/rod ever hit an angle of 0 degrees with the horizontal? If so, how long will it take to reach that point?