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the phenomenon observed when a material exhibits z
Question:
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”!
TS PGECET - 2024
TS PGECET
Updated On:
July 22, 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.
Step 2: What is Superconductivity?
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.
Step 3: Why the other options are incorrect.
(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.
Therefore, the phenomenon of
zero electrical resistance below a critical temperature
is called
superconductivity
.
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