What is the strength of the magnetic field a distance of 1 meter from a wire carrying a current of 1 A?

equation:
B=MoI
------
2(pi)r

Mo=4(pi)x 10^-7
I=1 A
How do I know what r is?

r is one meter, given.

To determine the value of "r" in the equation, you need to know the distance from the wire carrying the current to the point where you want to calculate the magnetic field strength. In this case, you are looking for the strength of the magnetic field at a distance of 1 meter from the wire. Therefore, "r" would be equal to 1 meter in this scenario.

Using the equation you provided:
B = (μ₀ * I) / (2π * r)

Where:
μ₀ = 4π x 10^-7 (permeability of free space)
I = 1 A (current)
r = 1 meter (distance from the wire)

You can now substitute the known values into the equation:
B = (4π x 10^-7 * 1 A) / (2π * 1 meter)

Simplifying the equation:
B = (4π x 10^-7) / (2π)

The π in the numerator and the denominator cancels out:
B = 2 x 10^-7 Tesla

Therefore, at a distance of 1 meter from the wire carrying a current of 1 A, the strength of the magnetic field would be 2 x 10^-7 Tesla.