The resistance of a conductor at absolute zero (OK) is________________?
Correct answer: A. zero almost
- A. zero almost
- B. infinite almost
- C. no prediction at all
- D. may increase or decrease
Explanation
In the ideal textbook model for a metallic conductor, thermal vibrations vanish as the temperature approaches 0 K, so its resistance becomes nearly zero. Option b may be selected by confusing low temperature with the high resistance produced by heating, although real materials can show exceptions such as residual resistance or superconductivity.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Resistance and Resistivity
Resistance measures opposition to current in a conductor and follows R = V/I for an ohmic conductor, while resistivity is an intrinsic property of the material. Questions use R = ρL/A, examine effects of length, cross-sectional area and temperature, and distinguish resistance, resistivity, conductance and conductivity.
Practise Current Electricity
1,052 free Current Electricity MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Resistance and Resistivity questions
Which one of the following bulbs has the least resistance ?
Which of the following substances posses the highest elasticity ?
What are the dimensions of stress ?
The graphical representation of Ohms law is___________________?
Three bulbs are rating 40W 60W and 100W designed to work on 220V mains. Which bulb will burn most brightly if they are connected in series across 220 V mains ?
Which one is the best material for making connecting wires ?