Consider two concentric conducting spheres. The outer sphere is hollow and initi

Question

Consider two concentric conducting spheres. The outer sphere is hollow and initially has a charge Q110Q deposited on it. The inner sphere is solid and has a charge Q2 +4Q on it. 1) (a) How much charge is on the outer surface? Submit You currently have 0 submissions for this question. Only 10 submission are allowed. You can make 10 more submissions for this question. 2) How much charge is on the inner surface? Q Submit You currently have 0 submissions for this question. Only 10 submission are allowed. You can make 10 more submissions for this question. 3) (b) Suppose a wire is connected between the inner and outer spheres. Electrostatic equilibrium is established. How much charge is on the outer surface of the outside sphere? Q Submit You currently have 0 submissions for this question. Only 10 submission are allowed. You can make 10 more submissions for this question. 4) How much is on the inner surface? Q How, if at all, does the electric field at the surface of the inside sphere change when the wire is connected? Submit You currently have 0 submissions for this question. Only 10 submission are allowed

Explanation / Answer

1)

Q1 = -Q2 + Qouter

-10Q = -4Q + Qouter

Qouter = -6Q

(2)

an equal and opposite charge is induced on the inner

Qinner = -Q2 = -4Q

(3)

there is no charge on the inner surface and -6Q on the outer surface remains as it is

Qouter = -6Q

(4)

Qinnner = 0

(5)

-6Q on the outer sphere is drained off

it changes from finite value to zero

6)

Qinner = -4Q

7)

+4Q

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