Question
If a wire of resistance R is melted and recast to half of its length then the new resistance of the wire will be
Answers
roshan
2R
abrar
Its new resistance is R
Karanveer Singh
R/4, refer to the formula; R= pL/A, where p is resistivity and L is it's length and A being the area.
The new area is twice the previous one and length is half, so the new resistance becomes R/4.
The new area is twice the previous one and length is half, so the new resistance becomes R/4.