AQA A Level Physics 3.7.4.2 Parallel plate capacitor

A capacitor is composed of...

SELECT ALL CORRECT ANSWERS

• Two conducting plates

• One conducting plate

• An insulator

• A neutral plate

• Three conducting plates

When a capacitor is connected to a cell, the plate connected to the positive terminal becomes ​ (a)   charged, because it ​ (b)   ​ (c)   . The plate connected to the negative plate becomes ​ (d)   charged, because it ​ (e)   electrons.

• positively
• electrons
• loses
• negatively
• gains
• protons
• charges

Match:

• Capacitance

• Permittivity of free space

• Area of overlap of plates

• Distance of separation between plates

• Relative permittivity

Identify the correct relationship:

Permittivity is a measure of how well a material allows an electric ​ (a)   to penetrate it. Relative permittivity is a value with ​ (b)   units, that compares a material against the permittivity of a ​ (c)   . The higher the number, the ​ (d)   the ​ (e)   .

• no
• F/m
• vacuum
• conductor
• better
• worse
• dielectric
• insulator
• material
• field

A good dielectric has...

• polar molecules

• neutral molecules

• large molecules

• small molecules

• symmetrical molecules

A good dielectric...

• reduces the total electric field

• increases the total electric field

• reduces the total magnetic field

• increases the total magnetic field

• maintains the total electric field

A good dielectric...

• reduces the voltage across the plates

• increases the voltage across the plates

• reduces the resistance of the capacitor

• increases the resistance of the capacitor

• maintains the electric properties of the capacitor

A good dielectric...

• increases the capacitance of the capacitor

• reduces the capacitance of the capacitor

• reinforces the capacitance of the capacitor

• maintains the electric properties of the capacitor

We can measure the capacitance of a capacitor by using...

• a capacitance meter in parallel

• an ammeter and a voltmeter in series

• a joulemeter in parallel

• an ohmmeter in series

• an ammeter and a voltmeter in parallel