Choose the CORRECT statement regarding Ohm’s law:

  1. It is valid for any circumstances, i.e. independent of temperature
  2. Ohm’s law is valid for all conducting materials
  3. The temperature must be constant for validation of this law
  4. All are wrong

Answer (Detailed Solution Below)

Option 3 : The temperature must be constant for validation of this law
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NDA 01/2025: English Subject Test
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Detailed Solution

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The correct answer is The temperature must be constant for validation of this law.

CONCEPT:

  • Ohm’s law: At constant temperature, the current flowing through a resistance is directly proportional to the potential difference across its end.

F1 J.K 2.6.20 Pallavi D7

V = R I

Where V = the potential difference, R = resistance, and I = current flowing.

  • Ohmic resistance: The resistance that follows ohm’s law is called ohmic resistance.
  • All resistances don’t follow ohm’s law.

EXPLANATION:

  • Since ohm’s law is only valid for constant temperature. If we change the temperature then the resistance of the conductor will change and that will change the relationship between current and potential difference. So statement 3 is correct and statement 1 is wrong. So option 3 is correct.
  • It is only valid for ohmic resistance. So statement 2 is not correct.
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