Question

Force of attraction or repulsion between two current carrying wires separated by a distance r is proportional to

• A. r
• B. $r^2$
• C. $\frac{1}{r}$
• D. $\frac{1}{r^2}$

Answer 1

Answer: (C)

$\frac{1}{r}$

Answer 2

Using , F = $\frac{\mu_0 I_1 I_2}{2 \, \pi \, r}$ , we find that F $\propto \frac{1}{r}$.