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⚛️ Physics  ·  Current Electricity  ·  NEET & JEE

Mobility of charge carriers increases when:

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.

SeriesbatteryR1R2I (same in R1, R2)ParallelbatteryR1R2I1I2

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.

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