A certain fuse "blows" if the current in it exceeds 1.0 A, at which instant the fuse melts with a current density of 620 A/cm². What is the diameter of the wire in the fuse? A) 0.45 mm B) 0.63 mm C) 0.68 mm D) 0.91 mm

Question

Quizplus · Accepted Answer

The correct answer is A because the diameter of the wire in the fuse can be calculated using the formula d = (4A/πJ)^(1/2), where d is the diameter, A is the current, and J is the current density. Plugging in the given values, we get d = (4 * 1.0 A / π * 620 A/cm^2)^(1/2) = 0.45 mm.

A Certain Fuse "Blows" If the Current in It Exceeds