MEDIUM
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Statement-1: For calculation of current in resistors of resistance R1, R2 and R3 in the circuit shown in the figure 1, the circuit can be redrawn as shown in the figure 2 (this means that circuit shown in the figure 2 is equivalent to circuit shown in the figure 1). All the cells shown are ideal and identical.

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Statement-2: Whenever potential difference across two resistors is the same, both the resistors can be assumed as a combination of two resistors in parallel.

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Important Questions on Current Electricity

MEDIUM
The current I1 (in A ) flowing through 1Ω resistor in the following circuit is:
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MEDIUM

The equivalent resistance between A and B for the mesh shown in the figure is

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MEDIUM

Thirteen resistors each of resistance R are connected in the circuit as shown in the following figure. Net resistance between A and B 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:
MEDIUM
Two wires of equal diameters, lengths l1,l2 and having resistivities S1,S2 respectively are joined in series. The equivalent resistivity of the combination is ____
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

Six similar bulbs are connected as shown in the figure with a DC source of emf E, and zero internal resistance.
The ratio of power consumption by the bulbs when i all are glowing and ii in the situation when two from section A and one from section B are glowing will be, 
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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

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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HARD
The figure shows three circuits I, II and III which are connected to a 3 V battery. If the powers dissipated by the configurations I, II and III are P1, P2 and P3 respectively, then -

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MEDIUM
Four resistors, 100 Ω, 200 Ω, 300 Ω and 400 Ω are connected to form four sides of a square. The resistors can be connected in any order. What is the maximum possible equivalent resistance across the diagonal of the square?
HARD

Each resistance in the given cubical network has resistance of 1Ω and equivalent resistance between A and B is

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HARD

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What will be the equivalent resistance between the terminals A and B of the infinite resistive network shown in the figure ?

EASY

Five equal resistances are connected in a network as shown in figure. The net resistance between the points A and B is :

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MEDIUM

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

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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:
MEDIUM
Equivalent resistance between points A and B in the adjacent circuit is

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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.