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Resistance is directly proportional to the length of the wire. As length is doubled, so mass is doubled and resistance is doubled.

1. Resistance remains the same.
2. Resistance is halved.
3. Resistance is doubled.
4. Resistance is quadrupled.

Correct answer: Resistance is doubled.

Solution

Resistance (R) is directly proportional to the length (L) of the wire and inversely proportional to its cross-sectional area (A). If only the length is doubled and the cross-sectional area remains constant, the resistance will also double.

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