Question

Force between 2 protons separated by a distance r varies as
(a) r2
(b)1/r2
(c) r
(D)1/r

Answer 1

Explanation:

Let the charge of proton is q

Charge of α−particle

=2×chargeofproton

=2q

The force acting between two protons separated by a distance r is

F=k

r

2

q⋅q

=k

r

2

q

2

The force acting between two α− patricles separated by a distance 2r is

F

′

=k

(2r)

2

2q⋅2q

=k

4r

2

4q

2

or =kr²/r²

⇒F′=F