Physics 9702 · AS & A Level · Electric force between point charges
Electric force between point charges — practice question
(a(i))[1]
State Coulomb’s law for the force acting between two point charges.
(a(ii))[3]
Two point charges are in a vacuum and are separated by $R$. The force between them is $F_{C}$. On Fig. 5.1, sketch a graph showing how the force $F$ varies with separation $x$ for values of $x$ from $x = R$ to $x = 4R$.
(b)
As shown in Fig. 5.2, coils C and D are placed close together.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “force is proportional to the product of the charges and inversely proportional to the square of their separation” …