An electrically charged metal object with charge q is placed within a closed con

Question

An electrically charged metal object with charge q is placed within a closed conducting can that is sitting on an insulator.

     1. The fraction of charge that appears on the outside of the can depends on the ratio of the masses of the two objects.

2.  Half the charge appears on the outside of the can.

3.   When the metal object is withdrawn, it takes only half its original charge q with it, leaving the can with charge q/2.

4.   The fraction of charge that appears on the outside of the can depends on the ratio of the areas of the two objects.

5.   When the metal object is withdrawn, it takes all its original charge q with it, leaving the can uncharged again.

6.  All the charge appears on the outside of the can.

7.   The fraction of charge that appears on the outside of the can depends on the ratio of the maximum curvatures of the two objects.

Explanation / Answer

1. While the metal object is inside the metal can and the can is not grounded, there is an electric field outside the can, appropriate to a charge q.

4. While the metal object is inside the can and the can is connected to ground, there is an electric field outside the can, appropriate to a charge q

4. The fraction of charge that appears on the outside of the can depends on the ratio of the areas of the two objects6. All the charge appears on the outside of the can.

6. All the charge appears on the outside of the can.

7. The fraction of charge that appears on the outside of the can depends on the ratio of the maximum curvatures of the two objects

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