Home
Class 10
PHYSICS
The resistivity of three metals namely i...

The resistivity of three metals namely iron, silver and mercury are `10xx10^(-8) Omegam, 1.6xx10^(-8) Omega` and `94xx10^(-8) Omega`m respectively. Answer the following using given data
(a) Which among iron, silver and mercury is the best conductor ?
(b) If the length of the iron conductor is doubled, what will happen to its resistivity ?
Given reason for your answers.

Text Solution

Verified by Experts

(a) Silver is the best conductor, as its resistivity is the least among these metals.
(b) The resistivity of iron will remain the same, as resistivity of the material is a constant value for that material.
Promotional Banner

Similar Questions

Explore conceptually related problems

Use the data in Table 12.2 to answer the following - (a) Which among iron and mercury is better conductor? (b) Which material is the best conductor?

two galvanometers of resistance 100Omega and 50Omega , are 10^(-8)A//"div and "2 xx 10^(-5) A/div respectively. In which case the voltage sensitivity is more ?

The average radii of orbits of mercury and earth around the sun are 6xx10^(7) km and 1.5xx10^(8) km respectively. The ratio of their orbital speeds will be :-

Judge the equivalent resistance when the following are connected in parallel. (a) 1 Omega and 10^6 Omega (b) 1 Omega and 10^8 Omega and 10^6 Omega .

The resistivity of a potentiometer wire is 40xx10^(-8)Omega-m and its area of cross section is 8xx10^(-6)m^(2) . If 0.2 A current is flowing through the wire the potential gradient will be

The wavelength of the chartacristic Ka X - rays of iron and potassium are 1.931 xx 10^(-8) and 3.737 xx 10^(-8) respectively .What is the atomic number of an element for which the characteristic Ka wavelength is 2.289 xx 10^(-8) cm ?

The resistances of an iron wire and a copper wire at 20^(@)C are 3.9(Omega) and 4.1(Omega) respectively. At what temperature will the resistances be equal?Temperature coefficient of resistivity for iron is 5.0xx10^(-3)K^(-1) and for copper it is 4.0xx10^(-3)k^(-1). Neglect any thermal expansion.

The solubility products of MA, MB, MC and MD are 1.8xx10^(-10), 4xx10^(-3), 4xx10^(-8) and 6xx10^(-5) respectively. If a 0.01M solution of MX is added dropwise to a mixture containing A^(-), B^(-), C^(-) and D^(-) ions, then the one to be precipitated first will be:

A hollow cylinder (rho=2.2 xx 10^(-8)Omega-m) of length 3 m has inner and outer diameters are 2 mm and 4 mm respectively. The resistance of the cylinder is

A wire made of aluminum having resistivity rho = 2.8 xx10^(-8) Omega - m with a circular cross - section and has a radius of 2xx10^(-3) m. A current of 5 A flows through the wire . If the voltage difference between the ends is 1 V , the length of the wire in m is