An alpha particle (charge = +2.0e) is sent at high speed toward a gold nucleus (charge = +79e). What is the electric force acting on the alpha particle when the alpha particle is 2.0 × 10−14 m from the gold nucleus?

F = 91.27 N

Explanation:

Parameters given:

Charge of alpha particle, q = +2.0e = =

Charge of gold nucleus, Q = +79e = =

Distance between the alpha particle and gold nucleus, r =

Electric force is given as:

F =

where k = Coulomb's constant

Therefore:

The electric force acting on the alpha particle when the alpha particle is from the gold nucleus is 91.27 N.

the answer would be a

i don't understand. explain it clearly