Question

V-I graph for a metallic wire at two different temperature T1 and T2 is as shown in the following figure. Which of the two temperature is higher?

Answer 1

Answer: T2>T1

Explanation:

The given graph is a I V graph, where I is current and V is voltage. The slope of the given graph is I/V

We know that

According to the Ohm's law

V=IR

Therefore, V/I= R

Hence the given graph is inverse of resistance that is 1/R

Resistance of material increases with increase in temperature. This is because collision between the particles increases as atoms vibrate more vigorously and emit more energy. Thus the resistance increases.

In the graph, T1 has bigger slope than T2

Hence it has lower resistance

Thus, T2>T1

Answer 2

Answer:

PHYSICS

I−V graph for a metallic wire at two different temperatures, T

1

and T

2

is a shown in the figure.

Which of the two temperature is lower and why?

question

October 15, 2019avatar

Omkar Rudhrapati

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VIDEO EXPLANATION

ANSWER

Slope of a V-I graph gives value of 1/R , as we can see that the slope of graph 1 is greater than graph 2 ,so

1/R

1

>1/R

2

or R

2

>R

1

we know that the resistance of metals increases with increase in temperature therefore

T

2

>T

1

it means T

1

is lower because R

1

is smaller .