Question

To study the dependence of current (1) on the
potential difference (V), three students plotted the
following graphs between (V) and (), as per their
respective observations:
Which of the following students had the correct
observations?
Studenti
Student II
Student III
All three students​

Answer 1

Answer:

Explanation:

Student B

Answer 2

Answer:

Student II had the correct observations.

According to Ohm's law the potential difference(V) applied at the ends of a conductor is directly proportional to the current(I) flowing through it.

We know that, the graph of any 2 physical

quantities which are directly proportional to each other is always a straight line inclined at an angle to the x axis.

Reasons for answer-

1) The first option is incorrect because here, it is shown that the current flows without any potential difference (which is never possible) .

Here,The graph should begin from origin not from above from it.

2)The third option is incorrect because the graph (straight line) started from negative y axis which shows that current is negative which is never possible because current is a scalar quantity.

3) Since first and third options are incorrect ,

fourth option is automatically

incorrect.