Question

The resistance of a wire is 24$O$. lt is so stretched that the length becomes four times, then the new resistance of wire will be

• A. $248 O$
• B. $298 O$
• C. $384 O$
• D. $428 O$

Answer 1

Answer: (C)

$384 O$

Answer 2

In case of stretching of wire $R ? l^2$.
If length becomes 4 times, so resistance becomes 16 times,
ie,
$P'=16 \times 24=384 O$