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The time constant of the shown circuit for charging is

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Important Questions on Current Electricity

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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 3
Consider the circuit below, with an initially uncharged capacitor and two identical resistors. At the instant the switch is closed :

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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 4

Consider the MB shown in the diagram, let the resistance X have temperature coefficient α1 and the resistance from the RB have the temperature coefficient α2. Let the reading of the meter scale be 10 cm from the LHS. If the temperature of the two resistance increase by small temperature ΔT then what is the shift in the position of the null point? Neglect all the other changes in the bridge due to temperature rise.

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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 5
Identify which of the following diagrams represent the internal construction of the coils wound in a resistance box or box ?
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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 6
In a meter bridge set up, which of the following should be the properties of the one meter long wire?
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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 7
A short circuit occurs in a telephone cable having a resistance of 0.45 Ω m-1. The circuit is tested with a Wheatstone bridge. The two resistors in the ratio arms of the Wheatstone bridge network have values of 100 Ω and 1110 Ω respectively. A balance condition is found when the variable resistor has a value of 400 Ω. Calculate the distance down the cable, where the short has occurred.
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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 8
Two wires each of radius of cross section r but of different materials are connected together end to end (in series). If the densities of charge carriers in the two wires are in the ratio 1: 4, the drift velocity of electrons in the two wires will be in the ratio :
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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 9
A current I flows through a uniform wire of diameter dwhen the mean electron drift velocity is V The same current will flow through a wire of diameter d2 made of the same material if the mean drift velocity of the electron is
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Beta Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 10
A wire has a non–uniform cross–section as shown in figure. A steady current flows through it. The drift speed of electrons at points P and Q is vP and vQ, then :-

 

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