Calculate the critical current for a wire of lead having a diameter of 1mm at 4.2 K. Calculate temperature for lead is 7.18 K and Hc = 6.5 104 A/m. Critical field is 42.758 103 A/m.

Calculate the critical current for a wire of lead having a diameter of

1.	Calculate the critical current for a wire of lead having a diameter of 1mm at 4.2 K. Calculate temperature for lead is 7.18 K and H_c = 6.5 10⁴ A/m. Critical field is 42.758 10³ A/m.
A.	3.5593 A
B.	27.3 A
C.	46.67 A
D.	134.26 A
Answer» E.