Capacitance

Question 1

capacitance is
its units are ?

Answer 1

the charge stored per unit volt
Farads

Question 2

what is meant by a dielectric constant of 5

Answer 2

the ratio of permittivity of the medium/ permittivity of free space
is 5

Question 3

explain how a dielectric will increase the capacitance of a capacitor

Answer 3

the polar molecules of the capacitor will align, positive side of molecule with neg side of capacitor ect ,
this produces their own electric fields in the opposite direction
this causes the overall electric field between the plates to decrease
E = V/D
the PD between the plates decreases but the charge remains the same
C= Q/V
so capacitance increases

Question 4

capacitance graphs

Answer 4

For discharging all are same, all from top to bottom
for charging, Voltage and Charge / time graphs start from bottom to top, starts off steep then reduces steepness