Question

i-v graph for a metallic wire at two different temperature T1 and t2 is as shown in the figure which of two temperature is lower than why

Answer 1

T2 will have less heat because h=i^2.r.t.

If I increase then heat will increase by square.

In fact, the slope of graph could be measured by taking T2 and less when compare with value of resistance and increase with increasing temperature.

This should be identified with t2>t1.

At certain temperature, the resistance is increasing by value of V/I=R.

Answer 2

Temperature T₁ is higher than the Temperature T₂, this is because If the temperature will increase then by the concept of the the Heating effect of the current, there will be rise in current. Thus, the graph will be having the more slope.

For the Temperature T₂, line is having a small slope than the temperature T₁ because of the high temp., heating is produced as a result current has been increased.

Note ⇒ Ohm's law is only valid in case, the temperature remains constant, but in this expression temperature is not constant therefore, ohm's law will be not valid. But it can me make valid on different temperatures at a time.

Hope it helps.