# Determining magnetic field around two parallel wires

• buckeyes
In summary, two long, straight wires with currents of 3.5 A in opposite directions are separated by 0.12 m. The net magnetic field at point A can be found by using the Biot-Savart Law to calculate the individual magnetic fields of each wire and then adding them together. However, at point B, both wires have magnetic fields that point into the page, so they must be subtracted from each other before adding them to get the net magnetic field.
buckeyes
Two long, straight wires are separated by 0.12 m. The wires carry currents of 3.5 A in opposite directions, as the drawing indicates.

(a) Find the magnitude of the net magnetic field at the point A.

(b) Find the magnitude of the net magnetic field at the point B.

/Users/ashleyhoward/Documents/21_56.gif

here is what i did
at point b, both wires B field point into the page (because of RHR) so i find the Bfield of each wire using B=((4(pi)x10e-7)x-3.5)/2x.06 =-3.67x10e-5 the other wire is the same mag. only positive because it is in the opposite direction. since both B fields ar in the same direction at point b i would just add the two together and that would give me the B field at that point. but this was incorrect. i would then do the same thing at point a but i wanted to get point b correct first. what have i done wrong

If you do not pay attention to where you are posting question like this, you may not be able to post on here that much longer.

Zz.

what do you mean?

oh i see what you mean now. i didn't realize there was a homework section

...but can anyone help me with this problem

## 1. How do you determine the direction of the magnetic field around two parallel wires?

The direction of the magnetic field around two parallel wires can be determined using the right-hand rule. Point your right thumb in the direction of the current flow in one wire and your fingers will curl in the direction of the magnetic field.

## 2. What factors affect the strength of the magnetic field around two parallel wires?

The strength of the magnetic field around two parallel wires is affected by the distance between the wires, the current flowing through the wires, and the properties of the material surrounding the wires.

## 3. How do you calculate the magnitude of the magnetic field around two parallel wires?

The magnitude of the magnetic field around two parallel wires can be calculated using the formula B = μ0I/2πr, where μ0 is the permeability of free space, I is the current, and r is the distance between the wires.

## 4. What is the relationship between the direction of the magnetic field and the direction of the current in two parallel wires?

The direction of the magnetic field around two parallel wires is perpendicular to the direction of the current flowing through the wires. This means that if the current in one wire is flowing towards you, the magnetic field will be circling around the wire in a counterclockwise direction.

## 5. How does the magnetic field around two parallel wires affect nearby objects?

The magnetic field around two parallel wires can induce a current in nearby conductive objects, which can cause them to move or heat up. The strength of this effect depends on the distance between the wires and the properties of the nearby objects.

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