EASY
Earn 100

What is the effect of pressure on resistance?

Important Questions on Current Electricity

EASY
The solids which have the negative temperature coefficient of resistance are:
HARD
Resistivity of the material of a conductor having uniform area of cross-section varies along its length on x, according to the relation ρ=ρ0a+bx; if L is length and A is cross-section area of conductor, then resistance of the conductor given by ρ0,a,b are constants)
MEDIUM

In a conductor, if the number of conduction electrons per unit volume is 8.5×1028  m-3 and mean free time is 25fs (femtosecond), its approximate resistivity is: me=9.1×10-31kg

 

EASY
A piece of copper and another of germanium are cooled from room temperature to 77° K. The resistance of
EASY
The temperature dependence of resistance of Cu and undoped Si in the temperature range 300-400 K is best described by
EASY
What happens to LED when LDR is exposed to light?
EASY
The specific resistance of a wire is ρ, its volume is 3 m3 and its resistance is 3 Ω, then its length will be
EASY
If a negligibly small current is passed through a wire of length 15 m and of resistance 5 Ω having uniform cross-section of 6×10-7 m2, then coefficient of resistivity of material, is
MEDIUM

Represent the union of two sets by Venn diagram for each of the following.

X={x | x is a prime number between 80 and 100}

Y={y | y is an odd number between 90 and 100}

EASY
What is the effect of resistivity on resistance?
HARD
Why does resistivity decreases with increasing of the conductivity?
EASY
What is the relation between light and resistance?
EASY
The length of a conductor is doubled and its radius is halved, its specific resistance is
EASY
Why does resistance increase with magnetic field?
EASY
Does increasing the resistance increase the magnetic field strength?