The equivalent resistance across AB is :

   

1.  2R

2.  R/2

3.  4R/3

4.  3R/2

Concept Questions :-

Combination of resistors
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An electric Kettle draws 4.2A at 250V. How much time it would take to boil 1kg of water at 20°C completely to 1000 C ?

1.  320 seconds

2.  64 seconds

3.  3840 seconds

4.  960 seconds

Concept Questions :-

Heating effect of current
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The equivalent resistance between points A and B in the circuit shown in the figure is 

                       

1.  6R

2.  4R

3.  2R

4.  R

Concept Questions :-

Combination of resistors
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A wire has resistance 24 Ω. It is bent in the form of a circle. The effective resistance between the two point on the diameter of the circle is 

(1) 6Ω

(2) 4Ω

(3) 3Ω

(4) 12Ω

Concept Questions :-

Combination of resistors
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The drift velocity of the electrons in a current-carrying  metallic conductor is of the order of 

1.  104 m/s  

2.  108 m/s 

3.  100m/s 

4.  10-4m/s

Concept Questions :-

Current and current density
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In the circuit shown in the figure, the effective resistance between A and B is

                            

1.  2Ω

2.  4Ω

3.  6Ω

4.  8Ω

Concept Questions :-

Combination of resistors
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For the circuit shown in the figure, the value of R must be

                       

1.  3Ω

2.  4Ω

3.  5Ω

4.  6Ω

Concept Questions :-

Kirchoff's voltage law
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If I be the current limit of a fuse wire of length l and radius r, then select the appropriate relation

(1) I α l

(2) I α r2

(3) I α l0

(4) I α r0

Concept Questions :-

Heating effect of current
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The resistance of a platinum wire at 0°C is 22.05Ω and at 100°C it becomes 22.70Ω. When the wire is heated to a temperature of t°C the resistance of wire becomes 24.91Ω. The value of t is

1.  220

2.  440

3.  310

4.  550

Concept Questions :-

Derivation of Ohm's law
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Two wire A and B of copper have equal masses and the lengths are 10cm and 20cm respectively. If resistance of A be RA and B be RB, then the value of RARB is  

1.  12 

2.  2 

3.  14 

4.   4

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