Consider a coin in Question 20. It is electrically neutral and contains equal amounts of positive and negative charge of magnitude 34.8 kC. Suppose that these equal charges were concentrated in two-point charges separated by:

(i) 1 cm ( 12x diagonal of the one paisa coin)

(ii) 100 m (  length of a long building)

(iii) 106 m (radius of the earth). Find the force on each such point charge in each of the three cases. What do you conclude from these results?

Hint: Use the coulomb's law.
Step 1: Find the force between the charges in each case.
Here, 
q=±34.8 kC=±3.48×104C
r1=1 cm=10-2 m, r2=100 m, r3=106 m and 14πε0=9×109
F1=|q|24πε0r12=9×109×3.48×104210-22=1.09×1023 N
F2=|q|24πε0r22=9×109×3.48×1042(100)2=1.09×1015 N
F3=|q|24πε0r32=9×109×348×10421062=1.09×107 N
Step 2: Find the conclusion by observing the force between the charges.
When charges in an electrically neutral matter are separated by a distance, they exert a large force on each other and hence, it is no possible to separate the charges in an electrically neutral matter.