we are told that the answers to d, e and f are expressions NOT numbers A spheric
ID: 1525509 • Letter: W
Question
we are told that the answers to d, e and f are expressions NOT numbers
A spherical conductor has two spherical cavities. A charge q _1=7.00 mu C is placed at the center of one cavity and a charge q_2 = 4.00 mu C is placed at the center of the other cavity. Additionally, a charge q = 2.00 mu C is placed on the conductor. What is the charge on the surface of the smaller cavity? What is the charge on the surface of the bigger cavity? What is the charge on the outer surface of the conductor? What is the magnitude of the electric field in the smaller cavity? What is the magnitude of the electric field in the larger cavity? What is the magnitude of the electric field outside the conductor? sketch the electric field lines in the two cavities and in the region outside the conductor. What is the electrostatic force on q_1?Explanation / Answer
(a) The charge on the surface of the smaller cavity
Answer is -7 uC
The Field inside the spherical cavity is independent of anything outside ,so a charge -q1 i.e -7 uC is uniformly distribuited to cancel the field from Q = 2 uC
(b) The bigger cavity
Answer is 4 uC
The Field inside the spherical cavity is independent of anything outside ,so a charge -q2 i.e +4 uC is uniformly distribuited to cancel the field from Q = 2 uC
(C)
Charge on the outer surface
Qouter = - 7 - (+4) = -11 uC
(d) The electric field in the smaller cavity
Answer is E = 0
Electric field inside a conductor is zero
(e) The larger cavity
the outer shell the electric field is zero
E = 0
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