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please explain The figure below shows two concentric spherical conducting shells

ID: 2104938 • Letter: P

Question


please explain

The figure below shows two concentric spherical conducting shells The inner shell has an inner radius of 0.4 in and an outer radius of 0.5 in and carries a net charge of QI = -30 mu C and the outer shell has an inner radius of 1.4 m and an outer radius of 1.5 m and carries a net charge of Qo = +10 mu C. If the electric field a distance r = 2.0 in away from the center of the distribution is pointing inward and has a magnitude of 9000 N/C, determine the charge that is at the center of the distribution. -16 mu C -8 mu C 0 mu C +8 mu C +16 mu C None of the above.

Explanation / Answer

E = kQ/r^2 ===========> Q = -4uC


Q= q1+q2+ q=========> q =- 4+30-10 = +16 uC