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# Capacitors PowerPoint PPT Presentation

Capacitors. Two large parallel sheets of charge are separated by a distance d , small compared to the size of the sheets . The distance d is small enough that the sheets can be treated as if they were infinite in extent . .

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Capacitors

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## Capacitors

Two large parallel sheets of charge are separated by a distance d , small compared to the size of the sheets. The distance d is small enough that the sheets can be treated as if they were infinite in extent.

Where do you expect the E field to point at the position A?

• It should point to the left.

• It should be essentially 0.

• It should point to the right.

A

C

B

NEXUS/Physics Clicker Questions

Two large parallel sheets of charge are separated by a distance d , small compared to the size of the sheets. The distance d is small enough that the sheets can be treated as if they were infinite in extent.

Where do you expect the E field to point at the position B?

• It should point to the left.

• It should be essentially 0.

• It should point to the right.

A

C

B

NEXUS/Physics Clicker Questions

Two large parallel sheets of charge are separated by a distance d , small compared to the size of the sheets. The distance d is small enough that the sheets can be treated as if they were infinite in extent.

Where do you expect the E field to point at the position C?

• It should point to the left.

• It should be essentially 0.

• It should point to the right.

A

C

B

NEXUS/Physics Clicker Questions

If the sheets can be treated as if they were infinitely large, which of the following graphs might serve as a graph of the x-component of the electric field as a function of the coordinate x along the dotted line?

NEXUS/Physics Clicker Questions

If the sheets can be treated as if they were infinitely large, which of the following graphs might serve as a graph of the electric potential as a function of the coordinate x along the dotted line?

NEXUS/Physics Clicker Questions

E

+

+

+

+

+

+

+

V

0

### What would happen to the voltage if you first disconnected the battery and then pulled the plates further apart?

• The potential difference would increase.

• The potential difference would decrease.

• The potential difference would stay the same.

NEXUS/Physics Clicker Questions

E

+

+

+

+

+

+

+

V

0

### What would happen to the voltage if you stayed connected to the battery and then pulled the plates further apart?

• The potential difference would increase.

• The potential difference would decrease.

• The potential difference would stay the same.

NEXUS/Physics Clicker Questions

E

+

+

+

+

+

+

+

V

0

### What would happen to the voltage if you stayed connected to the battery and then pulled the plates further apart?

• The charge on each platewould increase.

• The charge on each platewould decrease.

• The charge on each platewould stay the same.

NEXUS/Physics Clicker Questions

Cap #1 is charged by connecting it to a battery. Cap #2 is not charged.C#1 is disconnected from the battery and connected to C#2. How does the magnitude of the E field in C#1 change?

• Stays the same

• Bigger by ~X2

• Bigger but not by ~X2

• Smaller by ~X2

• Smaller but not by ~X2

• Can’t tell

NEXUS/Physics Clicker Questions

Three capacitors 1, 2, 3 are connected to identical batteries so they each have the same ΔV. Their plate areas and separations are as follows: A2 = 2 A1 = 2 A3; d1 = d2 = 2d3.How do the E fields inside them rank?

• E2= E3> E1

• E3> E1= E2

• E2> E1> E3

• E2> E1= E3

• E1= E2> E3

• E1= E2= E3

• Other

NEXUS/Physics Clicker Questions

Three capacitors 1, 2, 3 are connected to identical batteries so they each have the same ΔV. Their plate areas and separations are as follows: A2 = 2 A1 = 2 A3; d1 = d2 = 2d3.How do the net charges on them rank?

• Q2 = Q3 > Q1

• Q3 > Q1 = Q2

• Q2 > Q1 > Q3

• Q2 > Q1 = Q3

• Q1 = Q2 > Q3

• Q1 = Q2 = Q3

• Other

NEXUS/Physics Clicker Questions

Three capacitors 1, 2, 3 are connected to identical batteries so they each have the same ΔV. Their plate areas and separations are as follows: A2 = 2 A1 = 2 A3; d1 = d2 = 2d3.How do the positive charges on their top plate rank?

• Q2 = Q3 > Q1

• Q3 > Q1 = Q2

• Q2 > Q1 > Q3

• Q2 > Q1 = Q3

• Q1 = Q2 > Q3

• Q1 = Q2 = Q3

• Other

NEXUS/Physics Clicker Questions

Three capacitors 1, 2, 3 are connected to identical batteries so they each have the same ΔV. Their plate areas and separations are as follows: A2 = 2 A1 = 2 A3; d1 = d2 = 2d3.How do the voltage drops across their plates rank?

• ΔV2 = ΔV3 > ΔV1

• ΔV3 > ΔV1 = ΔV2

• ΔV2 > ΔV1 > ΔV3

• ΔV2 > ΔV1 = ΔV3

• ΔV1 = ΔV2 > ΔV3

• ΔV1 = ΔV2 = ΔV3

• Other

NEXUS/Physics Clicker Questions

• Suppose we:

• Close A for a few seconds

• Open A

• Close B

• What happens to the bulb?

• It stays off.

• It stays on after you close A

• It stays on after you close B

• It flashes when you close A

• It flashes when you open A

• It flashes when you close B

B

NEXUS/Physics Clicker Questions

A

Suppose the capacitor is connected to the battery. The plates remain connected and an insulating slab of dielectric constant 𝜅 ( > 1) is slid between the plates. What happens to the electrical energy stored in the capacitor as a result of inserting the insulating slab?

• The stored electrical energy increases.

• The stored electrical energy remains the same.

• The stored electrical energy decreases.

NEXUS/Physics Clicker Questions