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Answer : Resistance of a wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is  4 r.

Description : If a copper wire is increased to double its length, its resistance will become (1) four times (2) one–fourth (3) double (4) half

Answer : double

Description : Indicate the false statement about the resistance of a wire (1) it depends on material of wire (2) it is directly proportional to the length of wire (3) it is directly proportional to the area of cross-section of wire (4) resistance of metallic wire increases with increase in temperature

Answer :  it is directly proportional to the area of cross-section of wire

Description : If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be

Answer : R/4

Description : What happens to the resistance of a wire when its length as well as the cross-sectional area are doubled? A) It doubles B) It becomes 4 times C) It becomes 2π times D) It remains the same

Answer : Automatically the resistivity will increase as they are the factors affecting the resistivity