A carbon resistor of 47 ± 4.7 kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be:

Yellow - Violet - Orange - Silver

Violet - Yellow - Orange - Silver

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In a meter bridge, the wire of length $1 m$ has a non-uniform cross-section such that, the variation $\frac{d R}{d l}$ of its resistance $R$ with length $l$ is $\frac{d R}{d l} \propto \frac{1}{\sqrt{l}} .$ Two equal resistances are connected as shown in the figure. The galvanometer has zero deflection when the jockey is at point $P .$ What is the length $A P$ ?

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Important Questions on Current Electricity

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IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 73

A galvanometer, whose resistance is

50 ohm

, has

25

divisions in it. When a current of

4 \times 10^{- 4}

A passes through it, its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range

2.5 V

it should be connected to a resistance of:

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 74

In the given circuit diagram, the currents, $I_{1} = 0.3 A, I_{4} = 0.8 A$ and $I_{5} = 0.4 A,$ are flowing as shown. The currents $I_{2}, I_{3}$ and $I_{6},$ respectively, are -

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 75

Consider the junction diode as ideal. Find the value of current flowing through $A B$ :

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 76

In which of the following devices, the eddy current effect is not used?

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 77

400 Ω

of resistance is made by adding four

100 Ω

resistance of tolerance

5 %

then the tolerance of the combination is

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 78

Let

C

be the capacitance of a capacitor discharging through a resistor

R

. Suppose

t_{1}

be the time taken for the energy stored in the capacitor to reduce to half its initial value and

t_{2}

be the time taken for the charge to reduce to one-fourth of its initial value. Then the ratio

\frac{t_{1}}{t_{2}}

will be,

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 79

A resistor

R

and a capacitor of capacitance

2 μF

in series are connected through a switch to

200 V

direct supply. Across the capacitor is a neon bulb that lights up at

120 V

. Calculate the value of

R

to make the bulb light up

5 s

after the switch has been closed

(\log_{10} 2.5 = 0.4)

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 80

A combination of two identical capacitors, a resistor

R

and a

D C

voltage source of voltage

6 V

is used in an experiment on a

(C - R)

circuit. It is found that for a parallel combination of the capacitor the time in which the voltage of the fully charged combination reduces to half its original voltage is

10 second

. For series combination, the time needed for reducing the voltage of the fully charged series combination by half is

Important Questions on Current Electricity

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