# Chapter 8 Dielectrics¶

## Example 8.1 Page no 303¶

In [1]:
#Given
k =3                       #Dielectric constant
E=1*10**6
e =8.85*10**-12

#Calculation
P=e*(k -1)*E
D=k*e*E
ED =0.5*k*e*E**2

#Result
print"Polarisation is",P,"C/m**2"
print"Displacement is",D,"C/m**2"
print"Energy density is",round(ED,2),"joule s/m**3"

Polarisation is 1.77e-05 C/m**2
Displacement is 2.655e-05 C/m**2
Energy density is 13.27 joule s/m**3


## Example 8.2 Page no 303¶

In [3]:
#Given
D=5*10**-4
P=4*10**-4
V =0.5

#Calculation
E=D-P
k=D/E
p=P*V

#Result
print"Dielectric constant is",k
print"Total dipole constant is",p*10**4,"*10**-4 m**5"

Dielectric constant is 5.0
Total dipole constant is 2.0 *10**-4 m**5


## Example 8.3 Page no 303¶

In [4]:
#Given
k =1.000038

#Calculation
x=k-1

#Result
print"Electric susceptibility is",x

Electric susceptibility is 3.8e-05


## Example 8.4 Page no 303¶

In [7]:
#Given
E =100
k =1.000074
e =8.85*10**-12
p =22.4*10**-3
a=6*10**23

#Calculation
N=a/p
p=e*(k -1) *E/N

#Result
print"Total moment is",round(p*10**40,2)*10**-40,"cm"

Total moment is 2.445e-39 cm


## Example 8.6 Page no 304¶

In [8]:
#Given
K=1.329

#Calculation
k=K-1

#Result
print"Electric susceptibility is",k

Electric susceptibility is 0.329