A point charge -3 pC is concentric with two spherical conducting thick shells, a
ID: 2149422 • Letter: A
Question
A point charge -3 pC is concentric with two spherical conducting thick shells, as show in the figure below. The smaller spherical conducting shell has a net charge of -27 pC and the larger spherical conducting shell has a net charge of 12 pC. What is the charge on the inner surface of the smaller spherical conducting shell, 2.2 cm from the -3 pC point charge? Under static conditions, the charge on a conductor resides on the surface of the conductor. Answer in units of pC What is the charge on the outer surface of the smaller spherical conducting shell, 4.9 cm from the -3 pC point charge? Answer in units of pC What is the charge on the inner surface of the larger spherical conducting shell, 6.7 cm from the -3 pC point charge? Answer in units of pC What is the charge on the outer surface of the larger spherical conducting shell, 8 cm from the -3 pC point charge? Answer in units of pC What is the magnitude of the electric field at P1, 1.1 cm from the -3 pC point charge? Answer in units of N/C What is the magnitude of the electric field at P2, 3.55 cm from the -3 pC point charge? Answer in units of N/C What is the magnitude of the electric field at F3, 5.8 cm from the -3 pC point charge? Answer in units of N/C What is the magnitude of the electric field at P4, 7.35 cm from the -3 pC point charge? Answer in units of N/C What is the magnitude of the electric field at P5, 8.65 cm from the -3 pC point charge? Answer in units of N/CExplanation / Answer
1)-3 pC
2)-30 pC
3)-30 pC
4)-18 pC
5) -3 pC/(4o)(1.1 x 10-2 m)2 = -223.14 N/C
6) -30 pC x (3.55 x 10-2 m)/(4o)(4.9 x 10-2 m)3 = -81.471 N/C
7) -30 pC/(4o)(5.8 x 10-2 m)2 = -80.262 N/C
8) -18 pC x (7.35 x 10-2 m)/(4o)(8 x 10-2 m)3 = -23.256 N/C
9) -18 pC/(4o)(8.65 x 10-2 m)2 = -21.651 N/C
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