Identify the correct statement(s) from the following Resistivity (ρ) versus Temperature (T) graphs:
(A) Graph (i), shows ρ versus T variation for Copper
(B) Graph (ii), shows ρ versus T variation for Silicon
(C) Graph (iii), shows ρ versus T variation for semiconductor
(D) Graph (iii), shows ρ versus T variation for Nichrome
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A) and (C) only
Correct statements: (A) and (C)
Explanation:
Graph (i): For metals such as Copper, resistivity $ \rho $ increases with rise in temperature due to enhanced lattice vibrations (positive temperature coefficient). Hence, (A) is correct.
Graph (iii): For semiconductors like Silicon, resistivity $ \rho $ decreases with rise in temperature because more charge carriers are generated (negative temperature coefficient). Hence, (C) is correct.