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Two resistances $R_{1}$ and $R_{2}$ are joined as shown in the figure, to two batteries of emf $E_{1}$ and $E_{2}$ . If $E_{2}$ is short-circuited the current through $R_{1}$ is

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Important Questions on Current Electricity

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 28

An electric bulb, rated at

100 W

230 V

, is connected to source of

230 V AC

mains. The bulb is lighted for

100

days at the rate of

10 h

per day. What is the cost of light consumed by the bulb, if

1

unit of electricity costs

50

paise ?

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 29

Two electric bulbs whose resistance are in the ratio

1 : 2

are connected in parallel to a constant voltage source. The power dissipated in them will have the ratio

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 30

In the electrical circuit shown below, what is the effective resistance between points $P$ and $Q$ ?

Question Image

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 31

If in an electric circuit,

30 C

of charge flow in

5 s

, then the current through it is

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 32

A factory gets its electrical power from a generator

2 km

away. The two wires connecting the generator to the factory terminals have a resistance of

0.04 Ohm {km}^{- 1}

. When the generator supplies

50 A

to the factory, the terminal voltage at the generator is

220 V

. A voltmeter connected to the factory terminal should then read

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 33

The resistance of certain length of a wire having a diameter of

6 mm

5 Ω

. The wire is drawn such that the diameter becomes

3 mm

. The new resistance will be,

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 34

A current of

5 A

is passing through a metallic wire of cross-sectional area

4 \times 10^{- 6} m^{2}

. If the density of the charge carriers in the wire is

5 \times 10^{26} m^{- 3}

, the drift velocity of the electron is,

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 11 - Current Electricity>Practice Exercise>Q 35

A copper wire is stretched to make it

0.1 %

longer. The percentage change in its resistance is,

Two resistances R1 and R2 are joined as shown in the figure, to two batteries of emf E1 and E2. If E2 is short-circuited the current through R1 is

Important Questions on Current Electricity

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Two resistances $R_{1}$ and $R_{2}$ are joined as shown in the figure, to two batteries of emf $E_{1}$ and $E_{2}$ . If $E_{2}$ is short-circuited the current through $R_{1}$ is