Question

ort Answer Type Questions
14. (a) What do you understand by the “resistivity" of a substance ?
(b) A wire is 1.0 m long, 0.2 mm in diameter and has a resistance of 10 22
material ?
15. (a) Write down an expression for the resistance of a metallic wire in terms
(b) What will be the resistance of a metal wire of length 2 metre
1.55 x 10m2, if the resistivity of the metal be 2.8 x 10-8 92 m ?
6. (a) Give two examples of substances which are good conductors of electric
good conductors of electricity ?
() Calculate the resistance of a copper wire 1.0 km long and 0.50 mm diam
1.7 x 10-8 m.
7. Will current flow more easily through a thick wire or a thin wire of the s
the same source ? Give reason for your answer.
3. How does the resistance of a conductor depend on :
(a) length of the conductor ?
(b) area of cross-section of the conductor ?
(c) temperature of the conductor ?
- (a) Give one example to show how the resistance depends on the nature​

Answer 1

Answer:

hsvwbaaksohwgwvanlaosdhben