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

Concept Questions :-

Heating effect 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

Concept Questions :-

Current and 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

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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