The critical current of superconductors was measured by an inductive method. The experimental set-up consisted of a superconducting magnet into which a one turn, short-circuited sample was inserted. During the external field rise, the current will be induced in the sample. When this induced current rises up to the critical current, they will collapse. By the voltage taps attached on the sample and a pick-up coil, the quenches of the induced current was measured.
The critical current can be calculated using the values of the external field currents, their sweep rate and the quenching time.
The critical current of the multifilamentary superconductors was measured by this method and compared with that measured by the usual method of current and voltage measurements. They agreed well each other.
This inductive method is very useful to induce the large currents in the superconductor without potential leads and power sources.
