Can anybody help me with this? I haven\'t understood charges in Physics at all.

Question

Can anybody help me with this? I haven't understood charges in Physics at all. Thanks!

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. A charged insulating board is held above the pie pan. 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? Will there be a net charge on plate 2? Why or why not? If there is a net charge, what sign will it have? 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. sign of the charge on plate1 depends on charged insulating board. If insulating board has -ve charge plate1 gets +ve charge and if insulating board has +ve charge plate1 gets -ve charge. 2)no. net charge becomes zero. because charge can not flow from plate one plate2. 3) yes. when insulating board is brought up near the plate one charge flows from sphere to plate2.

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