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 . .

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Capacitors

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Capacitors

Capacitors


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


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 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


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 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


Capacitors

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


Capacitors

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


Capacitors

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


Capacitors

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


Capacitors

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


Capacitors

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


Capacitors

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


Capacitors

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


Capacitors

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


Capacitors

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


Capacitors

  • 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


Capacitors

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


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