Electric Potential: Capacitance Point Charge Concepts

What is a capacitor?

• A device for storing energy.

• A device for storing p.d.

• A device for storing charge.

• A device for storing capacitance.

What is the shape of the electric field between two flat charged plates.

• A uniform field between the plates with a curved field at the ends.

• A uniform field between the plates.

• A spherical field increasing towards infinity.

• A spherical field decreasing towards infinity.

Tags

NGSS.HS-PS3-5

Two horizontal parallel plate conductors are separated by a distance of 5.0 mm in air. The lower plate is earthed and the potential of the upper plate is + 50 V. Which of the following is correct at a point midway between the plates??

• E = 1x10^-4 Vm^-1 upwards ; V = 25V

• E = 1x10^-4 Vm^-1 downwards ; V = 25V

• E = 1x10^-4 Vm^-1 upwards ; V = 50V

• E = 1x10^-4 Vm^-1 downwards ; V = 50V

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Which of the following could be used to increase the capacitance of a capacitor?

• Increase the separation between each metal plate.

• decrease the area of the plate

• decrease the voltage

• Increase the permitivitty of the dielectric thus, directly decreasing voltage

If 4μF and 2μF capacitors are connected in series, the total capacitance is ___________.

• 1.33μF

• 0.75μF

• 6μF

• 2μF

Which of the following properties characterizes a series combination of 3 capacitors?

• 𝑄_𝑒𝑞=𝑄₁+𝑄₂+𝑄₃
• 𝑄_𝑒𝑞=𝑄₁=𝑄₂=𝑄₃
• C. Δ𝑉_𝑒𝑞=Δ𝑉₁=Δ𝑉₂=Δ𝑉₃
• ΔC_𝑒𝑞=Δ𝑉₁+Δ𝑉₂+Δ𝑉₃

When charging a capacitor, the transfer of charges stops when:

• the potential difference across the capacitor equals the potential difference across the battery
• the potential difference across the capacitor is greater than the potential difference across the battery
• the potential difference across the capacitor is smaller than the potential difference across the battery
• the capacitance of the capacitor increases

What charge is stored in a 180 μF capacitor when 120 V is applied to it? when Q=CxV

• 2.16 C
• .666 C
• .0216 C
• 6.6x10^-10 C

The capacitance of a parallel-plate capacitor is:

• directly proportional to the plate area

• inversely proportional to the charge stored

• independent of any material inserted between the plates

• directly proportional to the potential difference of the plates

The following are factors affecting capacitance, except.

• Dielectric in between the metal plates
• Area  of the metal plates
• Distance of separation of the metal plates
• Voltage across the metal plates