Question

Assertion: When the length of a wire is doubled, then its resistance also gets doubled

Reason: The resistance of a wire is directly proportional to its length.​

Answer 1

Yes. Both assertion and reason are true. When the length of a wire is doubled, its resistance also increases.

Why resistance is directly proportional to length?

• R ∝ L
• The resistance of a body is the result of the collision that negative ions or electrons face from the positive ions while moving from one side of the conductor to another.
• Thus, when the length of the conductor increases, the electrons have to face more collisions while moving.
• There will be more collisions in a longer conductor than in a shorter conductor.
• Due to more collisions, the resistance will also increase.

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Answer 2

Answer:

Both A and R are true and R is correct explanation of A