# Two concentric shells connected by a wire asap

• Conductivity

## Homework Statement

The problem states:
2 concentric shells made out of conductive materials as in the diagram. R2/ R1 = 6. If the shells were charged with a total charge of 100 nc the connected with a wire, Then the final charge on both shells would be?
1) 33.3, 66.7 2) 30, 70 3) 20, 80 4) 50,50 5) 14.3,85.7

## Homework Equations

Voltage at both end points of the wire should be the same

## The Attempt at a Solution

Shouldn't all the charge go to the outer shell? So it will be 0, 100

The solution provided used this formula:
Q1/ Q2 = R1/R2
https://prnt.sc/jmp453

Where we only used this formula for the case of two really far conducting shells connected with a wire.

Exam tomorrow, Thank you in advance.

While I’m sure someone will respond, my suggestion is to seek out a fellow student and see if you both can work this out since you’re concerned about your exam and we may not answer in time.

Conductivity said:
Shouldn't all the charge go to the outer shell?
It should. No potential difference between the two shells means no electric field. No field means no charge: a Gaussian volume, spherical, just inside the outer shell should not contain any charge.