Question

please explain why the answer is A and not C? ​

Answer 1

Answer:

Because of the strong electrostatic force of repulsion of positively charged protons and

alpha particle are cations ( positively charged ions, He2+) and

from Coulomb's law of Electrostatics,

$f = \frac{1}{4\pi \: e} \frac{q1 \times q2}{ {r }^{2} }$

$f \: directly \: proportional \: to \: \frac{1}{ {r}^{2} }$

so, Ans -A is correct.