Question

The temperature of a superconductor is gradually lowered. At the critical temperature, how does the resistivity of the superconductor change?
A. It reaches a constant positive value
B. It suddenly drops to zero
C. It begins a gradual decrease
D. It experiences a spike to its highest value

Answer 1

At critical temperature, the resistivity of the superconductor

B. It suddenly drops to zero

Explanation:

Materials can be classified into three different types depending on their resistance:

• Conductors: these materials have generally low resistance and allow electricity to pass through easily. The resistance of a conductor increases linearly with the temperature
• Insulators: these materials do not allow electricity to pass through - so they have very high resistance
• Semi-conductors: these are materials that are insulators are room temperature, however they becomes conductors when heated. Therefore, the resistance of a semiconductor decreases when the temperature increases
• Superconductors: these are special materials that are normally conductors; however, at very low temperatures (we are talking about temperature very near to 0 K), their resistance becomes suddenly zero.

Therefore, the correct answer is:

B. It suddenly drops to zero

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