Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 27

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Two wires of the same material but of different diameters carry the same current $i$ . If ratio of their diameters is $1 : 2$ , then the corresponding ratio of their mean drift velocities will be,

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Important Questions on Current Electricity

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 28

A constant current source is connected to a wire. If the wire is stretched to twice its length, then the drift velocity:

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 29

When the temperature of a conductor increase the ratio of conductivity and resistivity ______.

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 30

A current

i

is flowing through the wire of diameter

(d)

having drift velocity of electrons

v_{d}

in it. What will be new drift velocity when diameter of wire is made

\frac{d}{4} ?

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 31

The area of cross-section of a current carrying conductor is

A_{0}

and

\frac{A_{0}}{4}

at section

(1)

and

(2)

respectively. If

v_{d_{1}}

and

v_{d_{2}}

be the drift velocity at sections

(1)

and

(2)

respectively, then
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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 32

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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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

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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

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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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