Question

The parameter irrelevant for an electric fuse wire is

• A. its radius.
• B. its specific resistance.
• C. current flowing through it.
• D. its length.

Answer 1

The correct option is D its length.

For fuse wire expression for heat produced is given by eq. is $H=\frac{I^2\rho }{2{\pi }^2{r}^3}$
Hence, it is independent on length of fuse wire. Thus, the parameter irrelevant for an electric fuse wire is its length.