What is the electrical force between two protons 3.0 times 10^-15 m apart from e

Question

What is the electrical force between two protons 3.0 times 10^-15 m apart from each other in an atomic nucleus? (F = kq_1 q_2 r r^2) The charge of a proton is 1.6 times 10^-19C. A flashlight with a 1.5V battery has a light bulb with a resistance of 0.5 ohms. What is the current in the flashlight? (V = IR) How much work does the electric field do in moving a 2 micro Coulomb charge from a point at a potential of +125V to a point at -45V? (V_2 - V_1 = W/q) An electric motor has 120V and it produces a power of 240 watts. What is the resistance in the motor? (P = IV) and (V = IR) What is the electric potential 0.25 m from a 3.0 micro Coulomb point charge? (E = kq/r^2)

Explanation / Answer

12)The electrostatic force between two charges is given by:

F = kq1q2/r^2

q1 = q2 = q ; F = k q^2/r^2

F = 9 x 10^9 x (1.6 x 10^-19)^2/(3 x 10^-15)^2 = 25.6 N

Hence, F = 25.6 N

13)From Ohm's law

V = IR => I = V/R

I = 1.5/0.5 = 3 A

Hence, I = 3 A

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