If the free electron density be $n$ and relaxation time be $τ$ , the electrical conductivity of a conductor may be expressed as

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Important Questions on Current Electricity

EASY

CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 33

The drift velocity of the electrons in a copper wire of length

2 m

under the application of a potential difference of

220 V

is

0.5 m s^{- 1}

. Their mobility (in

m^{2} V^{- 1} s^{- 1}

) is

EASY

CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 34

The drift velocity of electrons in a conducting wire is of the order of

1 mm s^{- 1}

. Yet the bulb glows very quickly after the switch is put on because

EASY

CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 35

Two cylindrical rods of uniform cross-section area $A$ and $2 A,$ having free electrons per unit volume $2 n$ and $n,$ respectively, are joined in series. A current $I$ flows through them in steady-state. Then, the ratio of drift velocity of free electrons in the left rod to drift velocity of electrons in the right rod is,

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