Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 186

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A battery of internal resistance $2 Ω$ is connected to a variable resistor whose value can vary from $4 Ω$ to $10 Ω$ .The resistance is initially set at $4 Ω$ . If the resistance is now increased then

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Important Questions on Electric Current Through Conductors

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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 2

The electric current passes through a metallic wire produces heat because of

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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 3

In a hydrogen atom, the electron moves around the nucleus in a circular orbit of radius

5 \times 10^{- 11} m .

Its time period is

1.5 \times 10^{- 16} s

. The current associated with the electron motion is (charge of electron is

1.6 \times 10^{- 19} C

)

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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 4

A current of

4.8 A

is flowing in a conductor. The number of electrons passing through any cross-section per second is

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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 5

The quantity of charge that flows through a given cross-section in one second, when there is a steady current of one ampere is

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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 6

The net resistance of an ammeter should be small to ensure that

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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 7

A current of

0.5 A

is drawn by a filament of an electric bulb for

20 \min

. The amount of electric charge that flows through the circuit is,

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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 8

A

60 W

bulb carries current of

0.5 A

. The total charge passing through it in

1 h

is

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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 9

Two cylindrical rods of uniform cross-sectional 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 the drift velocity of a free electron in the left rod to the drift velocity of the electron in the right rod

(\frac{V_{L}}{V_{R}})

is,