Capacitors

Two plates hold identical and opposite electric charges, +Q and -Q, and are separated by a distance d. What is the electric potential at the mid-point between these two plates?

• 2Q

• Q / d

• 2Q / d

• zero

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Capacitors are made using 'dielectric materials'. Which of these statements best describes a dielectric material?

• A conductor that can be polarised

• A conductor that cannot be polarised

• An insulator that can be polarised

• An insulator that cannot be polarised

Tags

NGSS.HS-PS2-6

A simple capacitor of capacitance C is produced using 2 parallel plates of area A and separation d. (Air is used as the dielectric material). If the separation of the plates is halved to d/2 and the area of both plates is doubled, the new capacitance will be:

• C

• 2 C

• 4 C

• 8 C

Tags

NGSS.HS-PS2-4

A 10^-4 F capacitor is connected to a 10 V cell. What is the charge and energy stored on the capacitor?

• A

• B

• C

• D

Capacitor

• T

• C

• D

• R

In a rectifier, larger value of filter (or shunt) capacitor results in

• large peak-to-peak value of ripple voltage in the output.

• less peak-to-peak value of ripple voltage in the output.

• less output frequency in the output

• no change happens in output ripple voltage

Identical capacitors are connected in different combinations. Which of these capacitor networks has the largest capacitance?

• A

• B

• C

• D

Tags

NGSS.HS-PS3-5

The formula τ = RC can be used to find the time constant for the discharge of a capacitor through a resistor. The capacitor is initially charged to a potential of 1 V.

At a time t = τ, what is the voltage in volts across the capacitor?

• e

• e^-1

• 0.5

• 0

Which of the following graphs best shows the potential difference across a capacitor discharging through a resistor?

• A

• B

• C

• D

Which of the following graphs best shows the potential difference across a capacitor charging through a resistor?

• A

• B

• C

• D