# Chapter 28 GAUSS'S LAW¶

## Example 28.3 Electric ﬁeld strength¶

In [1]:
from __future__ import division
import math
r=1*10**-10 #radius of the atom in meter
Z=79 #gold atomic number
e=1.6*10**-19 #charge in coul
q=Z*e #total positive charge in coul
E=(9.0*10**9)*q/r**2
print("Electric field strength at the surface of the gold atom in nt/coul is %.3e"%E)

Electric field strength at the surface of the gold atom in nt/coul is 1.138e+13


## Example 28.4 Electric ﬁeld strength at the nuclear surface¶

In [2]:
from __future__ import division
import math
r=6.9*10**-15 #radius of the gold nucleus in meter
Z=79 #gold atomic number
e=1.6*10**-19 #charge in coul
q=Z*e #total positive charge in coul
E=(9.0*10**9)*q/r**2
print("Electric field strength at the surface of the gold atom in nt/coul is %.3e"%E)

Electric field strength at the surface of the gold atom in nt/coul is 2.389e+21