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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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

Concept Questions :-

Heating effect of current
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The resistance of a platinum wire at 0°C is 22.05Ω and at 100°C it becomes 22.70Ω. 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

Concept Questions :-

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

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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

Concept Questions :-

Meter bridge and 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

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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