In the circuit shown in figure, the current drawn from the battery is 4A. If 10 Ω resistor is replaced by 20 Ω resistor, then current drawn from the circuit will be 

(1) 1 A

(2) 2 A

(3) 3 A

(4) 4 A

Subtopic:  Combination of Resistors |
 83%
From NCERT
PMT - 2001
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If each of the resistance of the network shown in the figure is R, the equivalent resistance between A and B is 

(1) 5 R

(2) 3 R

(3) R

(4) R/2

Subtopic:  Combination of Resistors |
 86%
From NCERT
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Thirteen resistances each of resistance R ohm are connected in the circuit as shown in the figure below. The effective resistance between A and B is 

(1) 2R Ω

(2) 4R3  Ω

(3) 2R3  Ω

(4) R Ω

Subtopic:  Combination of Resistors |
 78%
From NCERT
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For what value of unknown resistance X, the potential difference between B and D will be zero in the circuit shown in the figure 

(1) 4 Ω

(2) 6 Ω

(3) 2 Ω

(4) 5 Ω

Subtopic:  Combination of Resistors | Wheatstone Bridge |
 90%
From NCERT
PMT - 2004
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Which arrangement of four identical resistances should be used to draw maximum energy from a cell of voltage \(V\).
1. 2.
3. 4.
Subtopic:  Combination of Resistors |
 64%
From NCERT
PMT - 2004
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An unknown resistance R1 is connected in series with a resistance of 10 Ω. This combinations is connected to one gap of a metre bridge while a resistance R2 is connected in the other gap. The balance point is at 50 cm. Now, when the 10 Ω resistance is removed the balance point shifts to 40 cm. The value of R1 is (in ohm

(1) 60

(2) 40

(3) 20

(4) 10

Subtopic:  Meter Bridge & Potentiometer |
 74%
From NCERT
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A wire has a resistance of 6 Ω. It is cut into two parts and both half values are connected in parallel. The new resistance is :

(1) 12 Ω

(2) 1.5 Ω

(3) 3 Ω

(4) 6 Ω

Subtopic:  Combination of Resistors |
 87%
From NCERT
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Six equal resistances are connected between points P, Q and R as shown in the figure. Then the net resistance will be maximum between

(1) P and Q

(2) Q and R

(3) P and R

(4) Any two points

Subtopic:  Combination of Resistors |
 82%
From NCERT
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The total current supplied to the circuit by the battery is:

         

1. \(1~\text{A}\)
2. \(2~\text{A}\)
3. \(4~\text{A}\)
4. \(6~\text{A}\)

Subtopic:  Combination of Resistors |
 65%
From NCERT
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An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of 4/3 and 2/3, then the ratio of the currents passing through the wire will be 

(1) 3

(2) 1/3

(3) 8/9

(4) 2

Subtopic:  Combination of Resistors |
 69%
From NCERT
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