Resistivities of copper, constantan and silver are `1.78 xx 10^-8 Omega` m, `4.91 xx 10^-8 Omega` and `1.6 xx10^-8 Omega` m respectively. which is the best conductor and why?

Resistivities of copper, silver and manganin are 1.7 xx10^-8 Omega m, 1.0 xx 10^-8 Omega m and 44 xx 10^-8 Omega m respectively. Which of these is the best conductor?

Write the nature of the material having resistivity of the order of 1.7 xx 10^-8 Omega m

Three cells of emf 2.0 v, 1.8 V and 1.5 V are connected in series. Their internal resistances are 0.05 Omega, 0.7 Omega " and " 1 Omega respectively. If the battery is connected to an external resistor of 4 Omega via a very resistance ammeter, what would be the reading in the ammeter ?

Find out the vlaue of 1 Bohr magneton. Givne h = 6.62 xx 10^-34 J s, e = 1.6 xx 10^-19C and m _e = 9.1 xx 10^-31 kg

Compare the following numbers 2.7 xx 10^12 , 1.5 xx 10^8

Judge the equivalent resistance when the following are connected in parallel: 1 Omega and 10^3Omega and 10^6 Omega

Write the sequence of colours in carbon resistor having resistance 25 xx 10^6Omega+-10%

Given that resistivity of copper is 1.68 xx 10^-8Omega m. Calculate the amount of copper required to draw a wire 10 km long having resistane 10Omega . The density of copper is 8.9 xx 10^3 kg m^-3