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Question 18 (10 points) The figure show two concentric spherical conductors. The inner sphere has a radius a = 10 cm and carries a net charge of +10.00 BC. The outer sphere is a shell of inner radius b = 20 cm, and outer radius c = 30 mm, and carries a net charge of -5.00 C. No other charges are present. (a) Apply Gauss's law to find the magnitude and direction of the electric field at points A, B, C and D at the following distances from the center of the inner sphere: (A) = 8 cm, (B)r=14.0 cm, (C)r=26.0 cm, (D) 7= 38.0 cm. D (b) Find the total excess charge on the inner and outer surfaces of the conducting shell (at radius a and b). P R W + P Question 19 (10 points. Consider the circuit in the figure at the right Let R1 =3.00, R2 = 2.000 and V-15.0 V. a) Find the equivalent resistance of the circuit b) Determine the magnetic field at point P (magnitude and direction), situated at 5 mm from the wire as shown in the figure. Assume that the wire is very long, and the other sides of the circuit are far away and don't contribute to the field. 1.00! R₂3 tu w 4.000