An aluminum pie pan is connected by a wire to a metal plate, called plate 1, as

Question

An aluminum pie pan is connected by a wire to a metal plate, called plate 1, as shown below. Sitting parallel to plate 1 is a second metal plate, called pate 2, that is separated from plate 1 by a 1.5 cm gap of air. A negatively charged insulating board is held above the pie pan. 1) Will there be a net charge on plate 1? Why, or why not? If there is a net charge, what sign will it have and how do you know? 2) Will there be a net charge on plate 2? Why or why not? If there is a net charge, what sign will it have? 3) In another trial plate 2 is connected by a wire to a very large metal sphere, the insulating board is brought up near the pie pan attached to plate 1, the wire is disconnected from plate 2, and finally the insulating board is moved away from plate 1. Will there be a net charge on plate 2 under these circumstances? Why or why not? If there is a net charge, what sign will it have and how do you know?

Explanation / Answer

1) Yes, There be a net charge on Plate-1.

When a negatively charged insulating board is brought near to the Aluminium pie pan. The electrons in the Aluminium Pie pan conductor experience a force of repulsion. With the connection of pie pan to plate-1 with the wire, these electrons will move to Plate-1.

So plate-1 will have negative charge.

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