HARD
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Find RAB, each individual resistance being R.

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Important Questions on Current Electricity

EASY

The current in the 1 Ω resistor shown in the circuit is,

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MEDIUM
The current I1 (in A ) flowing through 1Ω resistor in the following circuit is:
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EASY
A battery of 3.0 V is connected to a resistor dissipating 0.5 W of power. If the terminal voltage of the battery is 2.5 V, the power dissipated within the internal resistance is:
MEDIUM

The effective resistance between P and Q for the following network is

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EASY
A wire of resistance R is bent to form a square ABCD as shown in the figure. The effective resistance between E and C is:
( E is mid-point of arm CD )
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MEDIUM

Five identical resistors each of resistance R=1500 Ω are connected to a 300 V battery as shown in the circuit. The reading of the ideal ammeter A is

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EASY
Write one advantage of connecting electrical appliances in parallel combination.
MEDIUM

Five identical resistors, each of resistance 1 Ω, are initially arranged as shown in the figure by clear lines. If two similar resistances are added as shown by the dashed lines, then change in resistance in final and initial arrangements is,

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EASY

Fill in the blank with the most appropriate option given below.

We should give everyone training in citizenship, but we have______this aspect till now.

HARD
A metal wire of resistance 3Ω is elongated to make a uniform wire of double its previous length. This new wire is now bent and the ends joined to make a circle. If two points on this circle make an angle 60o at the center, the equivalent resistance between these two points will be:
EASY

The voltage across the 10 Ω resistor in the given circuit is x volt.

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The value of x to the nearest integer is _____.

HARD
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A 9 V battery with an internal resistance of 0.5 Ω is connected across an infinite network, as shown in the figure. All ammeters A1, A2, A3 and voltmeter V are ideal.
Choose the correct statement.
EASY
Two wires of same length and thickness having specific resistances 6 Ω cm and 3 Ω cm respectively are connected in parallel. The effective resistivity is ρ Ωcm. The value of ρ to the nearest integer, is ___ .
MEDIUM

A and B are two points on a uniform ring of resistance 19 Ω. The angle AOB=45°. The equivalent resistance between A and B is

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MEDIUM

In the given circuit, the value of current i2 is,

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EASY

In the given figure switches S1 and S2 are in open condition. The resistance across ab when the switches S1 and S2 are closed is ________Ω.

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MEDIUM
The ratio of maximum to minimum resistance that can be obtained with N number of 1 Ω resistors are
EASY
Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volts and the average resistance per km is 0.5 Ω. The power loss in the wire is:
MEDIUM
Equivalent resistance between points A and B in the adjacent circuit is

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EASY
A uniform metallic wire has a resistance of 18 Ω and is bent into an equilateral triangle. Then, the resistance between any two vertices of the triangle is: