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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In the circuit shown in  figure if power dissipated in 9Ω resistor is 144W, then potential difference across 3.6Ω resistor will be

1.  36V

2.  18V

3.  9V

4.  Zero

Subtopic:  Heating Effects of Current |
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A current of 1 mA is flowing through a copper wire. How many electrons will pass a given point in one second  e = 1.6 × 10-19 Coulomb

1.  6.25 × 1019  

2.  6.25 × 1015  

3.  6.25 × 1031  

4.  6.25 × 108

Subtopic:  Current & Current Density |
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The drift velocity of free electrons in a conductor is 'v' when a current 'i' is flowing in it. If both the radius and current are doubled, then drift velocity will be :

1.  v

2.  v2 

3.  v4 

4.  v8

Subtopic:  Current & Current Density |
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