Metre Bridge-Resistance of a wire
1)What is the best material used for making connecting wires? 
  

2)Conductivity is the reciprocal of _________. 
  

3)Two wires A and B are made of same material has equal length and A is having twice the area of B. Which of the following is true in this case? 
  

4)A wire has resistivity ρ, its length is doubled and its area of cross section is halved. What will be the new value of resistivity of the wire? 
  

5)The resistance of the conductor of unit length and unit area of cross section is called? 
  

6)Calculate the resistance of a copper wire of 50 m long and diameter 1 mm. Resistivity of copper is 1.7 x 10-8 Ωm. 
  

7)Find the resistivity of the material of a wire of length 1 m and diameter 2mm, if its resistance is 16 ohms. 
  


  


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