A fuse in an electric circuit is a wire that is designed to melt, and thereby open the circuit, if the current exceeds a predetermined value. Suppose that the material to be used in a fuse melts when the current density rises to 500 A/cm2. What diameter of cylindrical wire should be used to make a fuse that will limit the current to 0.64 A?

The diameter of wire should be m

Explanation:

Given:

Current density

Current A

From the formula of current density,

Where area of cylindrical wire =

   m

For finding the diameter of wire,

   m

Therefore, the diameter of wire should be m

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