please help me answer the following exercises

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Suppose the conducting spherical shell in the figure below carries a charge of 2.80 nC and that a charge of -2.40 nC is at the center of the sphere. If a = 1.80 m and b = 2.40 m, find the electric field at the following. (a) r = 1.50 m magnitude N/C direction ---Select--- V (b) r = 2.20 m magnitude N/C direction --Select--- V (c) r = 2.50 m magnitude N/C direction --Select--- (d) What is the charge distribution on the sphere? inner surface nc outer surface ncA point charge q is located at the center of a spherical shell of radius a that has a charge q uniformly distributed on its surface. Find the electric field for the following points: (a) for all points outside the spherical shell 05:0 0 none of these 0 E = keg/r2 O E = q/4zrr2 O E = keqz/r'2 (b) for a point inside the shell a distance rfrom the center 05:0 0 E = q/4n'r2 O E = kEIqZ/r2 O E = keq/r2 0 none of these Need Help? _' Show My Work (Optional) 0 Submit Answer l. [-I3 Points] SERCP11 16.1.P.007.MI. Oppositely charged parallel plates are separated by 4.13 mm. A potential difference of 600 V exists between the plates. (a) What is the magnitude of the electric field between the plates? N/C H (b) What is the magnitude of the force on an electron between the plates? N (c) How much work must be done on the electron to move it to the negative plate if it is initially positioned 2.78 mm from the positive plate? J H ta Oppositely charged parallel plates are separated by 4.13 mm. A potential difference of 600 V exists between the plates. (a) What is the magnitude of the electric eld between the plates? N/C H (b) What is the magnitude of the force on an electron between the plates? N (c) How much work must be done on the electron to move it to the negative plate if it is initially positioned 2.78 mm from the positive plate? J Need Help? H The figure below shows two small, charged beads separated by a distance ofd = 2.50 cm. The charges are q1 = 17.0 nC and q2 = 27.5 no Point 3 is at the midpoint between the two charges, and pointA is at the peak of an equilateral triangle, with each side of length d, as shown. (Assume the zero of electric potential is at infinity.) (a) What is the electric potential (in W) at point A? l W (b) What is the electric potential (in W) at point B? l W 1 Three charges are situated at corners of a rectangle as in the figure below' How much work must an external agent do to move the 8.0 pC charge to infinity? 8D,\": 6.0 cm 10 (In 66 10.1: m \"(1 E J Need Help? _ Show My Work (Optional) 0 I2. [-I3 Points] DETAILS SERCP11 16.2.P.015.MI. Two point charges Q1 = +4.40 nC and Q2 = 2.50 nC are separated by 55.0 cm. (a) What is the electric potential at a point midway between the charges? :lv (b) What is the potential energy of the pair of charges? l:lJ What is the signicance of the algebraic sign of your answer? 0 Positive work must be clone to separate the charges. 0 Negative work must be done to separate the charges