Question

A long, straight wire carries a current I0 and produces a magnetic field B0 at a distance r0 from the wire’s center.

Part A: In terms of B0, determine the magnetic-field strength at a distance r0/2 from the wire’s center.

Part B: In terms of B0, determine the magnetic-field strength at a distance 3r0 after the current is increased to 6I0.

Answer 1

Magnetic field in terms of B at a distancer. Part A: Magnetic field at point r/2 is given by, I. B2oto Part B Magnetic field at point 3r is given by, B, o(640) 2-2n(3%)