Question

If the area of cross-section of a resistance wire is halved, then its resistance becomes ______.

Options

• one-half

• two times

• one-fourth

• four times

Answer 1

If the area of cross-section of a resistance wire is halved, then its resistance becomes two times.

Explanation:

The resistance of a wire is inversely proportional to its area of cross-section (R ∝ `1/A`). When the area is halved, the resistance to electron flow doubles. Therefore, the new resistance becomes exactly twice its original value.