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 plate 2, that is separated from plate 1 by a 1.5 cm gap of air.

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 & why?

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

Here,

1) that d = 1.5 cm

So change cm to meter

1.5cm= 0.015 m

as the negative board is held closer to the pin ,

In there will be a net charge on the plate 1 ,

As there will charge induced in the pie plate.

In the net charge on the plate 1 is negative

as the charged board will repell the neagtive charge.

2)

there will not be a net charge on the plate 2.As there is no way for charge to flow.

3)

Yes ,

under these conditions there will be a net charge on the plate 2 as there is no way for charge to flow to the sphere attached.

the net charge on the plate 2 is positive as the charge on plate 1 is negative

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