The resistances in the two arms of the meter bridge are 5 and R , respectively. When the resistance R is shunted with an equal resistance, the new balance point is at 1.6l1. The resistance R, is


(1)10Ω

(2)15Ω

(3)20Ω

(4)25Ω 


Subtopic:  Kirchoff's Voltage Law |
 71%
From NCERT
NEET - 2014
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A potentiometer circuit has been setup for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of 2.0 V and a negligible internal resistance. The potentiometer wire itself is 4 m long. When the resistance, R, connected across the given cell, has values of

(i)infinity

(ii)9.5Ω 

the 'balancing lengths', on the potentiometer wire are found to be 3m and 2.85m, respectively. The value of internal resistance of the cell is

(1) 0.25Ω 

(2) 0.95Ω 

(3) 0.5Ω 

(4) 0.75Ω  

Subtopic:  Meter Bridge & Potentiometer |
 68%
From NCERT
NEET - 2014
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A wire of resistance 4Ω is stretched to twice its original length. The resistance of a stretched wire would be :

(1)2Ω

(2)4Ω

(3)8Ω

(4)16Ω 

Subtopic:  Combination of Resistors |
 82%
From NCERT
NEET - 2013
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The internal resistance of a 2.1V cell which gives a current of 0.2A through a resistance of 10Ω is :

(1)0.2Ω

(2)0.5Ω

(3)0.8Ω

(4)1.0Ω

Subtopic:  EMF & Terminal Voltage |
 87%
From NCERT
NEET - 2013
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The resistances of the four arms P, Q,R and S in a Wheatstone's bridge are 10Ω ,30Ω ,30Ω and 90Ω, respectively. The emf and internal resistance of the cell are 7 V and 5 Ω respectively. If the galvanometer resistance is 50Ω, the current drawn from the cell will be

(1) 1.0A

(2) 0.2A

(3) 0.1A

(4) 2.0A



Subtopic:  Wheatstone Bridge |
 78%
From NCERT
NEET - 2013
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In the circuit shown the cells A and B have negligible resistances. For VA=12V, R1=500Ω and R=100Ω the galvanometer (g) shown no deflection.The value of VB is 

(a)4V                                         (b)2V

(c)12V                                       (d)6V

Subtopic:  Kirchoff's Voltage Law |
 74%
From NCERT
NEET - 2012
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If voltage across a bulb rated 220 V-100 W drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is

(1)20%                                             

(2)2.5%

(3)5%                                               

(4)10%

Subtopic:  Heating Effects of Current |
 77%
From NCERT
NEET - 2012
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A ring is made of a wire having a resistane 

R0=12Ω. Find the points A and B, as shown

in the figure, at which a current carrying 

conductor should be connected so that the 

resistance R of the sub circuit between these

points is equal to 8/3Ω

1. l1l2=58                    2. l1l2=13

3. l1l2=38                    4. l1l2=12

 

Subtopic:  Combination of Resistors |
 51%
From NCERT
NEET - 2012
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The power dissipated in the circuit shown in

the figure is 30 Watt. The value of R is :

(1) 20Ω

(2) 15Ω

(3) 10Ω

(4) 30Ω

Subtopic:  Heating Effects of Current |
 84%
From NCERT
NEET - 2012
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A cell having an emf ε internal resistance r is connected across a variable external  resistance R. As the resistance R is increased, the plot of potential difference V across R is given by

(a)    

(b) 

(c) 

(d) 

Subtopic:  EMF & Terminal Voltage |
 56%
From NCERT
NEET - 2012
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