Question

Assertion(A): If a graph is plotted between the potential difference and the current flowing, the graph is a straight line passing through the origin. Reason(R): The current is directly proportional to the potential difference.
There are two statements Assertion (A) and Reason (R) given above. Read them carefully and choose the correct option if,
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false.
D. A is false but R is true.

Answer 1

Assertion(A): If a graph is plotted between the potential difference and the current flowing, the graph is a straight line passing through the origin.

Reason(R): The current is directly proportional to the potential difference.

Both A and R is true and R is the correct explaination of A

Explaination:

Graph between Potential Difference and Current:

$\setlength{\unitlength}{1cm}\begin{picture}(6,6)\put(3, 2){\vector(0,1){3}}\put(2, 3){\vector(1,0){3}}\put(3,3){\line(1,1){2}}\put(2,5){V}\put(5,3.25){I}\end{picture}$

Relation between current and potential difference:

$V = I \times R$

$=> I = \dfrac{V}{R}$

$=> I \propto V \:\:\:........(for \: constant \: R)$

So, the graph characteristics is linear , because current is directly proportional to the potential , provided the environmental conditions like temperature remain constant (for constant R).

Answer 2

Answer:

a is the correct answer

Explanation:

f a graph is plotted between the potential difference and the current flowing, the graph is a straight line passing through the origin.                           Reason(R): The current is directly proportional to the potential difference.

the reason is coorect explanation of a