Answer Happy

An electron is released from rest in a uniform electric field directed along X-dis. Me ILUM accelerates traveling 10m in negative direction of x-axis in the first 5ms after it is released. a) What are the magnitude and direction of the electric field? b) How (quantitatively) would you justify your answer? Point charge 4.=-10nC is at the origin, and point charge q=+5nC is at point (3cm, 0, 0). Calculate the magnitude and direction of the electric field due to these two charges at points: a) (0,3cm, 0); b) (0, -4cm, 0); c) (3cm, 3cm, 0); d) (-3cm, 3cm, 0). - Point charge 4.=-10nC is at the point (-3cm, 3cm, 0), point charge " +5nC is at point (3cm, 0, 0), point charge q* +10nC is at point (3cm, 3cm, 0). Calculate the magnitude and direction of the electric field due to these three charges at the origin. 6. A very long straight wire has charge per unit length +2x10°C/m. At what distance from the wire is the electric field magnitude equal to 2N/C? 5. Very large sheet of plastic has 3x10" excess electrons per square centimeter. Find the magnitude and direction of the electric field at a point 5cm from the surface of the sheet above its center. 3. Athin disc with a circular hole at its center (washer-like) has inner radius Ry=10 cm and outer radius R=20 cm. The disk has a uniform surface charge density ou +2x10C/m. a) Determine the total charge on the disk. b) The disk lies in the xy-plane with its center at the origin. For an arbitrary point on the z-axis, find the magnitude and direction of the electric field due to this ring. c) Find the magnitude and direction of the electric field due to this ring at point (0, 0,1m). In addition to the ring (as in problem 7) you place a point charge q= -10nC at the origin. Find the magnitude and direction of the electric field due to this combination at point(0,0,1m). Repeat problem 8 with a thin ring (centered on the origin) of radius re5cm and linear charge density A=-8x10 °C/m instead of the point charge. . Two horizontal parallel long wires with linear charge densities i = -8x10°C/m and 1= +8x10 C/m are 10m apart. a) Find the magnitude and direction of the electric field due to this combination at the point A in the middle between them. b) Find the magnitude and direction of the electric field due to this combination at a point B 1m above the point A. c) You place a proton in point A. What is its acceleration (magnitude and direction) immediately after you release it? Imagine a square (length of each side is a) made out of a very thin wire. Each side of the square is charged. Calculate the magnitude and direction of the electric field at the center of the squar in the following three cases: a) Top and bottom sides each have charge +Q, left and right -0. b) All sides have charge +Q. c) Top and bottom sides each have charge +Q, left +Q, and right-Q. mal problems (consider them to be practice problems) will be assigned in class