If a resistance coil is made by joining in parallel two resistances each of 20Ω. An emf of 2V is applied across this coil for 100 seconds. The heat produced in the coil is

(1) 20 J

(2) 10 J

(3) 40 J

(4) 80 J

Concept Questions :-

Heating effect of current
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Two battries of emf E1, E2 and internal resistance r1, r2 are connected in parallel. The effective emf of the circuit across A and B is

1.  E1r1 + E2r2r1 + r2  

2.  E1r2 + E2r1r1 + r2  

3.  E1r2 + E2r1r1 × r2  

4.  E1r1 + E2r2r1 - r2

Concept Questions :-

Grouping of cells
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Which of the following graphs correctly represents the variation of mobility μ of electrons with applied electric field E in a metallic conductor ?

1.  

2.  

3.  

4.  

Concept Questions :-

Current and current density
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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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