True or False (Question 1-7) Many computer keyboard buttons are constructed of c

Question

True or False (Question 1-7)

Many computer keyboard buttons are constructed of capacitors as shown in Figure 26.5. When a key is pushed down, the soli insulator between the movable plate and the fixed plate is compressed. When the key is pressed, what happens to the capacitance? (a) It increases. (b) It decreases. (c) It changes. () Consider a capacitor consisting of two parallel plates. It is charged already with +Q on one plate and -Q on the other plate. It is then isolated and not connected to anything else, so the charges will not move anywhere. Now if we increase the distance between the two plates, the E field in between the two plates will decreases. () Consider a capacitor consisting of two parallel plates. It is charged already with +Q on one plate and -Q on the other plate. It is then isolated and not connected to anything else, so the charges will not move anywhere. Now if we increase the distance between the two plates, the E field in between the two plates will stay the same, since E is only determined by the charge density which is not changed (Q and A are not changed). () Consider a capacitor consisting of two parallel plates. It is charged already with on one plate and -Q on the other plate. It is then isolated and not connected to anything else, so the charges will not move anywhere. Now if we increase the distance between the two plates, the E field in between the two plates will stay the same, but the voltage difference between the two plates will increase, side Delta V=Ed. Also C = Q/Delta V will decreases. () The capacitance of a capacitor is determined by its shape, size and separation distance. For a capacitor with two parallel plates, its capacitance increases when the plate area increases. () The capacitance of a capacitor is determined by its shape, size and separation distance. For a capacitor with two parallel plates, its capacitance increases when the plate area decreases. () The capacitance of a capacitor is determined by its shape, size and separation distance. For a capacitor with two parallel plates, its capacitance increases when the plate separation distance increases. () The capacitance of a capacitor is determined by its shape, size and separation distance. For a capacitor with two parallel plates, its capacitance increases when the plate separation distance decreases.

Explanation / Answer

1. if we increase the distance of already charged parallel plate capacitor there is no change in electric field as field don't depend upon gap. So anwer is false

2. true

3. true ,

4. true, capacitance directly proportional to area of plate.

5. false

6. false, capacitance is inversly proportional to distance between plate.

7. True.

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