Question:
The phenomenon observed when a material exhibits zero electrical resistance below a critical temperature is:
The phenomenon observed when a material exhibits zero electrical resistance below a critical temperature is:
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Zero resistance + expelling magnetic fields = superconductivity. Watch for the keyword “critical temperature”!
Updated On: May 28, 2025
- Ferromagnetism
- Superconductivity
- Photovoltaic effect
- Thermionic emission
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The Correct Option is B
Solution and Explanation
Step 1: Understand the term "zero electrical resistance".
- Electrical resistance opposes the flow of current.
- In most materials, resistance increases with temperature.
- But in certain materials, resistance drops to zero below a specific critical temperature.
- Superconductivity is a quantum mechanical phenomenon.
- Below a critical temperature (\( T_c \)), a material enters a state where:
- Electrical resistance becomes exactly zero.
- Magnetic fields are expelled (Meissner effect).
- This allows current to flow indefinitely without energy loss.
- (A) Ferromagnetism: Related to magnetic domain alignment, not zero resistance.
- (C) Photovoltaic effect: Involves conversion of light to electricity, not resistance behavior.
- (D) Thermionic emission: Refers to electron emission due to heat, unrelated to zero resistance.
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