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Chapter 29: Q. 8 (page 830)

The element niobium, which is a metal, is a superconductor (i.e., no electrical resistance) at temperatures below 9K. However, the superconductivity is destroyed if the magnetic field at the surface of the metal reaches or exceeds 0.10T. What is the maximum current in a straight,3mm diameter superconducting niobium wire?

Short Answer

Expert verified

The maximum current will be750A.

Step by step solution

01

Given information

We have given,

Magnetic field = 0.1T

Diameter of wire = 3mm

We have to find the maximum current in the straight niobium wire.

02

Simplify

The magnetic field due to wire will be

B=μ0I2πRI=BπDμ0=0.1×π×3×10-34×π×10-7I=750A

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