Question

the resistance of a wire is 16 volt. diameter of wire is double then it's new resistance will be​

Answer 1

Answer:

The new resistance of the wire becomes four times its old resistance. The wire's length is stretched to twice its length I.e. area of cross section decreases or becomes half, since volume remains the same.

Answer 2

Answer:

Reduces by four times

Explanation:

Resistance is given by

$R = \frac{ρl}{a}$

Here diameter has been doubled, so radius also doubles

hence area a becomes four times as

$a = \pi {r}^{2}$

As the area increases by four, the Resistance decreases by four times.