A pack of 100-dollar bills is charged so that each bill has a charge of -0.0100

Question

A pack of 100-dollar bills is charged so that each bill has a charge of -0.0100 uC. The pack is suspended by an insulating thread inside of a neutral safe made out of a conducting metal. No charge can flow between the bills and the safe, or the safe and its surroundings. (a) Explain how the induced charge effect will change the distribution of charges on the safe. (b) A burglar knows that there is no net electrical charge on the safe. If the charge on the outer surface has magnitude ?4.00  uC, what is the charge on the inner surface of the safe? (c) How much money is in the safe?

Explanation / Answer

A pack of 100-dollar bills is charged so that each bill has a charge of -0.0100 uC.

total charge of 100-dollar bills

=-100*0.01 uC.

=-1 uC.

insulating thread inside of a neutral safe made out of a conducting meta

generally metal s have free electrons

this total negative charge cannot induce on the metal

but it induces equal and opposite charge on insulating material

If the charge on the outer surface has magnitude -4.00  uC

c)

the total money is required 400 dollars bill

out of this

the charge on safe =-3.0uc

100 dollars of bill is safe

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