Question

The resistance of a conductor is directly proportional to?

• A. area of cross section of the conductor
• B. length of the conductor
• C. potential difference applied across the conductor
• D. current flowing through the conductor

Answer 1

Answer:

B. length of the conductor

• According to Ohm's law, resistance is directly proportional to the length of the conductor and inversely proportional to the area of cross-section of the conductor.

• Resistance is independent of potential difference and current.

• The current flowing through a wire is directly proportional to the potential difference applied across its ends, provided the physical conditions such as temperature remains unchanged.

• i.e. V = IR