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NEET2026PhysicsChapterActual

Match the physical quantities given in List I with their corresponding mathematical expressions in List II, where the symbols have their usual meanings. List I List II A Mobility 1 n e A v_d B Electrical Conductivity 2 v_d E C Electric Current 3 m l n e^2 A D Resistance 4 n e^2 m

Options

  1. AA - 4, B - 2, C - 1, D - 3
  2. BA - 2, B - 4, C - 1, D - 3
  3. CA - 2, B - 4, C - 3, D - 1
  4. DA - 4, B - 2, C - 3, D - 1

Correct answer

B. A - 2, B - 4, C - 1, D - 3

Step-by-step solution

Mobility ( ) is defined as the drift velocity of charge carriers per unit applied electric field: = v_d E Thus, A matches with 2. Electrical conductivity ( ) is related to the relaxation time ( ) and number density ( n ) by the formula: = n e^2 m Thus, B matches with 4. Electric current ( I ) flowing through a conductor of cross-sectional area A is given by: I = n e A v_d Thus, C matches with 1. Resistance ( R ) of a conductor of length l and area A is given by R = l A . Since resistivity = 1 = m n e^2 , we get: R

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