Answer: Temperature decreases (fewer collisions).
- A Temperature increases, raising the rate of lattice collisions
- B The rate of carrier scattering events increases
- C Temperature decreases (fewer collisions)
- D The bulk resistivity of the material increases
Correct answer: C. Temperature decreases (fewer collisions)
Explanation: Mobility = drift velocity / electric field = e*tau/m. tau (relaxation time) increases at lower temperature (fewer collisions), so mobility increases.
In series, the same current flows through both resistors; in parallel, the current splits between branches and the voltage across each resistor is the same.
Concept context
Ohm's law, resistors, Kirchhoff's laws, Wheatstone bridge, and cells.