question_answer

Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:

Assertion (A): For good conductors, the I-V graph is a perfect straight line inclined to current axis.

Reason (R): By Ohm's law, voltage across the ends of a conductor is directly proportional to the resistance of the conductor.

A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)        

B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)

C) Assertion (A) is true but Reason (R) is false             

D) Assertion (A) is false and Reason (R) is also false

Correct Answer: D

Solution :

(d) The given graph shows the V-I graph of a good conductor. Ohm's law states that, current flowing through conductor is directly proportional to the voltage between the ends of a given conductor, i.e., \[V\propto l\]. or             \[V=Rl\] where, the constant of proportionality R is called the resistance of the conductor.