Youll learn in Chapter 30 that a current can be induced in
Chapter 29, Problem 29.18(choose chapter or problem)
Youll learn in Chapter 30 that a current can be induced in a closed loop of wire. If the loop happens to be made of a superconducting material, with zero resistance, the induced current willin principlepersist forever. The current cannot be measured with an ammeter because any real ammeter has resistance that will quickly stop the current. Instead, physicists measure the persistent current in a superconducting loop by measuring its magnetic field. What is the current in a 3.0-mmdiameter superconducting loop if the axial magnetic field is 9.0 mT at a distance of 2.5 cm?
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