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Materials which obeys the ohm’s law show straight line in the VI graph. Since silver is the only ohmic material in given options, it shows straight line curve.
The following fig. shows IV graph for a given metallic wire at two temperatures T_{1}and T_{2}.Then,
The slope of the graph = I / V
In case of T_{2}, I/V is less. Hence, V/I (=R) is more.
Value of resistance increases with increasing temperature.
Hence, T_{2} >T
How many electrons are flowing per second through a section of a conductor corresponding to current of 1A?
I=Q/t
1 Ampere = 1 Coulomb /1 Secon
Charge on 1 electron = 1.6 x 10^19
Coulomb
By unitary method,
If 1.6 x 10^19 Coulomb / Second (Ampere) = Current by 1 electron
then, 1( Coulomb / Second) or (Ampere) = 1 / (1.6 x 10^19) electrons
i.e, 6.25 x 10^18 electrons.
1 Ohm is defined as the resistance of a conductor with a potential difference of 1 volt applied to the ends through which 1ampere current flows.
Ohms is the SI unit of electrical resistance.
Ohmic conductors are those which follows ohm's Law
Constantan is an copper nickle alloy which follows ohm's law
An electrolyte is a chemical that produces an electrically conducting solution and hence conducts electrical current.
But Electrolyte can be Ohmic as well as nonohmic conductor
Transistor is semiconductor device and does not follow ohm's Law
thermionic valves  is vacuum tube (electronic tube) , uses ion emission.
So option C Constanton s an ohmic conductor.
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