Question

Two parallel straight conductors, in which current is flowing in the same direction, attract each other. The cause of it is

• A. magnetic force between the two
• B. electric force between the two
• C. potential difference between the two
• D. mutual induction between the two

Answer 1

Answer: (A)

magnetic force between the two

The force between two long parallel conductors separated by distance r, is $F=\frac{{\mu }_0\left(i_1\right)\left(i_2\right)}{2\pi r}$

If the current is flowing in the same direction through both conductors, they will attract each other due to magnetic force between the two.