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Electric Circuits

Question 1
Physics 2 (2025)APConcept Practice
1 mark

Which of the following best describes resistance in an electrical circuit?

Question 2
Physics 2 (2025)APConcept Practice
1 mark

What is resistivity?

Question 3
Physics 2 (2025)APConcept Practice
1 mark

A copper wire has a resistivity of 1.72×108Ωm1.72 \times 10^{-8} \Omega \cdot m. What does this value represent?

Question 4
Physics 2 (2025)APConcept Practice
1 mark

What are the units of resistivity?

Question 5
Physics 2 (2025)APConcept Practice
1 mark

Which of the following factors affects the resistance of a material?

Question 6
Physics 2 (2025)APConcept Practice
1 mark

A wire has a resistance of 10Ω10 \Omega. If the wire is stretched to three times its original length, by what factor does its resistance change, assuming the resistivity remains constant?

Question 7
Physics 2 (2025)APConcept Practice
1 mark

A cylindrical resistor has a length LL and a cross-sectional area AA. If both the length and the radius are doubled, how does the resistance change?

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Question 8
Physics 2 (2025)APConcept Practice
1 mark

A wire of length LL and cross-sectional area AA has a resistance RR. If the wire is replaced with a wire of the same material but with length 2L2L and cross-sectional area A/2A/2, what is the new resistance?