To draw the magnetic field pattern of two parallel conductors carrying currents in opposite directions, you can follow these steps:
Draw two parallel lines representing the two conductors side by side.
Indicate the direction of current flow in each conductor. In this case, one conductor has a current flowing into the page (represented by a dot), and the other conductor has a current flowing out of the page (represented by a cross). This ensures the currents are flowing in opposite directions.
Apply the right-hand rule for determining the magnetic field around a current-carrying conductor. Curl your right-hand fingers around one conductor in the direction of the current. Your thumb will point in the direction of the magnetic field created by that conductor. Repeat this for the other conductor.
The magnetic field lines around each conductor will form concentric circles, perpendicular to the conductors.
Since the currents are flowing in opposite directions, the magnetic field lines will interact. At any point between the conductors, the magnetic field lines will be in opposite directions due to the currents flowing in opposite directions. This means that the magnetic field lines will tend to cancel each other out between the conductors.
Outside the conductors, the magnetic field lines will combine and form larger concentric circles around the two conductors.
As for the forces that may be present, the two parallel conductors will experience a force between them due to their interaction through the magnetic fields. This force is known as the magnetic force or the Ampere force. The force per unit length between two parallel conductors carrying currents can be calculated using the following formula:
F = μ₀ * I₁ * I₂ * L / (2πd),
where F is the force between the conductors, μ₀ is the permeability of free space (constant value), I₁ and I₂ are the currents in the two conductors, L is the length of the conductors, and d is the distance between them.
In the case of the given scenario, where the currents are equal in magnitude and flowing in opposite directions, the force between the conductors will be attractive, causing the conductors to move closer together.