Questions and Answers
If a wire of length $l$ and cross-sectional area $A$ has a resistance of $4 \Omega$, what is the resistance of another wire of the same material with length $l/2$ and cross-sectional area $2A$?
$1 \Omega$
According to the given text, what is the resistivity of manganese at 20°C?
$1.84 \times 10^{-6} \Omega \text{m}$
Which of the following factors does NOT affect the resistance of a conductor?
Color of the conductor
If the potential difference across an electrical component decreases to half of its former value, and its resistance remains constant, what happens to the current through it?
Signup and view all the answers
Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?
Signup and view all the answers
If the resistivity of a material is low, what can be inferred about its ability to conduct electricity?
Signup and view all the answers
Which of the following statements is correct regarding the flow of current through a thick wire versus a thin wire of the same material?
Signup and view all the answers
Which of the following materials is the best conductor, according to the data in Table 12.2?
Signup and view all the answers
If the resistance of a conductor increases, what happens to the current flowing through it, assuming the potential difference remains constant?
Signup and view all the answers
Which of the following statements is true regarding the relationship between resistance and temperature for metallic conductors?
Signup and view all the answers
