Question

Two parallel wires carry currents in opposite directions. How are they affected by one another?

A)They are insulated and therefore not affected by one another.

B)The wires are attracted to one another.

C)The magnetic fields cancel one another, and therefore they are not affected.

D)The wires are repelled by one another.

Answer 1

The correct answer is option D the wires are repelled by one another .

Reason is shown in figure .please do give feedback if you like

solution? x IT -|- ? VIL ben B (inside the plane of paper) Let B be the magnetic field due to wire I Bp Mo II (magnetic field at point p on wire 2) 2 Ad. (direction is inside the plane of paper! now, the Bp will event some forces as we know t . - Idex B direction of al will be along the flow of current which is along (- Î , ve ayaxis. Pr will be along ( § 3x (-²) = î (tue x aris) Hence, force applied on wir. I due to wire I is along tX aris Similarly wit we will found out that force applied on were I due to wire II is along -x axis .. (as shown in sig). Иen (e, B,€ч Аеред еасh сHae)