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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
Define resistivity in your own words.
💡 Hint: Consider how materials behave when electrical current passes through them.
Question 2
Easy
What happens to the resistivity of a metal as temperature increases?
💡 Hint: Think about what happens to atomic vibrations in a metal.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the relationship between temperature and resistivity for metals?
- Increases linearly
- Decreases linearly
- Remains constant
💡 Hint: Think about how atomic motion changes with temperature.
Question 2
True or False: The formula \(\rho(T) = \rho_0 [1 + \alpha (T - T_0)]\) can only be used for non-metal materials.
- True
- False
💡 Hint: Remember the general applicability of relationships in physics.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A wire made of copper has a resistivity of 1.68 × 10⁻⁸ Ω·m at 20 °C. If the temperature rises to 80 °C and the temperature coefficient is 0.0039°C⁻¹, calculate the new resistivity. What implications does this have for electrical applications?
💡 Hint: Pay special attention to ensure the thermal coefficient is correctly substituted.
Question 2
You have two materials: Material A with a higher temperature coefficient of resistivity than Material B. Given that both are used in high-temperature environments, discuss which material you would prefer for minimizing resistive losses in electrical applications and explain why.
💡 Hint: Analyze what the implications of the temperature coefficients are on performance.
Challenge and get performance evaluation