Insulator Metallic Shell An insulating sphere of radius 2 cm and charge -6 uC is surrounded by a spherical metallic shell of inner radius 4 cm and outer radius 8 cm. The outer shell has a net charge of -6 uC. The insulating sphere has a uniform volume charge density. What is the E field at 2.6 cm from the center of the insulating sphere?

An irregular neutral conductor has a hollow cavity inside of it and is insulated from its surroundings. An excess charge of 22.0 nC is sprayed onto this conductor. a. Find the charge on the inner surface of the conductor. b. Find the charge on the outer surface of the conductor. c. Without touching the conductor, a charge of -15.0 nC is inserted into the cavity through a small hole in the conductor. Find the charge on the inner surface of the conductor in this case. d. Find the charge on the outer surface of the conductor in this case.

Thin glass rod y Thin plastic disk In the figure shown above, a thin plastic disk of radius 0.6 m is uniformly charged with Qdisk = -3 × 10-7 C and is attached to a thin glass rod of length 2.4 m that is uniformly charged with Qrod = 5 x 10-8 C. The center of the rod and the center of disk are at the origin. The rod lies along the x axis and the disk lies in the yz plane. What is the (vector) electric field at location (0.02, 0.01, 0)m? value of €0 the Given that 8.85 x 10-12 C2/N.m². 1. (52400, -14900, 0) N/C 2. (37500, -52400,0)N/C 3. (-22600, 14900, 0) N/C 4. (-37500, 14900, 0)N/C 5. (-22600, -37500, 0)N/C 6. (-52400, 37500, 0) N/C 7. (37500, -14900, 0) N/C 8. (-14900, -22600, 0)N/C 9. (14900, -37500, 0) N/C 10. (-14900, 37500, 0) N/C

a 2.8-uC point charge is places in an external uniform electrric field of 2.4E4 N/C. At what distance from the charge is the net  electric field zero