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

Concept Questions :-

Current and current density
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A battery has e.m.f. 4V and internal resistance r. When this battery is connected to an external resistance of 2 ohms, a current of 1 amp. flows in the circuit. How much current will flow if the terminals of the battery are connected directly

1.  1 Amp

2.  2 Amp

3.  4 Amp

4.  Infinite

Concept Questions :-

Emf and terminal voltage
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Three copper wires have their lengths in the ratio 5:3:1 and their masses are in the ratio 1:3:5. Their electrical resistance will be in the ratio of :

1. 5:3:1

2. 1:3:5

3. 125:15:1

4. 1:15:125

Concept Questions :-

Derivation of Ohm's law
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The equivalent resistance between A and B is:

                           

1.  3Ω 

2.  6Ω  

3.  9Ω  

4.  12Ω

Concept Questions :-

Combination of resistors
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Current I as shown in the circuit will be

                 

1.  10 A

2.  203 A 

3.  23 A  

4.  53 A

 

Concept Questions :-

Combination of resistors
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A meter bridge is set up to determine unknown resistance x using a standard 10 Ω resistor. The galvanometer shows the null point when the tapping key is at a 52 cm mark. End corrections are 1 cm and 2 cm respectively for end A and B. Then the value of x is  

                                 

1.  10.2Ω

2.  10.6Ω

3.  10.8Ω

3. 11.1Ω

 

Concept Questions :-

Meter bridge and potentiometer
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The current through the 5Ω resistor is

                            

(1) 3.2A                     

(2) 2.8A

(3) 0.8A                     

(4) 0.2A

Concept Questions :-

Kirchoff's voltage law
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The current in a wire varies with time according to the relation i= (3+2t)A. The amount of charge passing a cross section of the wire in the time interval t=0 to t=4.0 sec would be (where t is time in seconds)

1.  28 C

2.  30.5 C

3.  8 C

4.  82 C

Concept Questions :-

Current and current density
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In the figure, a carbon resistor has bands of different colours on its body as shown. The value of the resistance is 

                                            

1.  2.2 

2.  3.3 

3.  5.6 

4.  9.1 

 

Concept Questions :-

Colour coding of resistors
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The resistivity of iron is 1 × 10–7 ohm m. The resistance of iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in ohm m will be :

(1) 1 × 10–7

(2) 2 × 10–7

(3) 4 × 10–7

(4) 8 × 10–7

Concept Questions :-

Derivation of Ohm's law
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Difficulty Level: