Directions: In the following questions, a statement of assertion (A) ...
It is a common error to say that V = Ri is a statement of Ohm’s law. The essence of Ohm’s law is that the value of R is independent of the value of V . The equation V — Ri is used for. finding resistance of all conducting devices, whether they obey Ohm’s law or not.
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Directions: In the following questions, a statement of assertion (A) ...
Assertion: The equation V = RI does not apply to those conducting devices which do not obey Ohm’s law.
Reason: V= RI is a statement of Ohm’s law.
The correct answer is option 'C' - Assertion (A) is true but reason (R) is false.
Explanation:
The assertion states that the equation V = RI does not apply to conducting devices that do not obey Ohm's law. This assertion is true because Ohm's law states that the current flowing through a conductor is directly proportional to the potential difference across it, provided its temperature remains constant. In other words, Ohm's law only applies to conductors that have a constant resistance, which means that the ratio of voltage to current is constant.
However, the reason given for the assertion is false. The reason states that V = RI is a statement of Ohm's law, which is incorrect. The correct statement of Ohm's law is V = IR, where V is the potential difference across the conductor, I is the current flowing through the conductor, and R is the resistance of the conductor. This equation shows that the potential difference is directly proportional to the current and inversely proportional to the resistance.
In summary, the assertion is true because the equation V = RI does not apply to conducting devices that do not obey Ohm's law. However, the reason given for the assertion is false because V = RI is not a statement of Ohm's law.
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