The magnetic field at a distance r from a very long wire carrying current is 0.8 T. The magnetic field at a distance of 4r is_____.
Question
Solution 1
The magnetic field B produced by a long straight wire at a distance r from the wire is given by Ampere's law as:
B = μ0I / (2πr)
where:
- B is the magnetic field
- μ0 is the permeability of free space (4π x 10^-7 T m/A)
- I is the current in the wire
- r is the distance from the wire
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