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.  

Subtopic:  Current & Current Density |
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NEET 2021 - Achiever Batch - Aryan Raj Singh
To view explanation, please enrol in the course below.
NEET 2021 - Achiever Batch - Aryan Raj Singh

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The equivalent resistance across AB is :

   

1.  2R

2.  R/2

3.  4R/3

4.  3R/2

Subtopic:  Combination of Resistors |
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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

Subtopic:  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

Subtopic:  Current & 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

Subtopic:  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

Subtopic:  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

Subtopic:  Heating Effects of Current |
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The resistance of platinum wire at 0°C is 22.05 Ω and at 100°C it becomes 22.70 Ω. 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

Subtopic:  Derivation of Ohm's Law |
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Two wire A and B of copper have equal masses and the lengths are 10 cm and 20 cm 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

Subtopic:  Derivation of Ohm's Law |
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The sensitivity of a potentiometer can be increased by

1.  increasing the potential gradient

2.  decreasing the length of potentiometer wire

3.  decreasing the current in the potentiometer wire

4.  all of these

Subtopic:  Meter Bridge & Potentiometer |
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