A 15-A fuse blows repeatedly. Why is it dangerous to replace this fuse with a 25-A fuse?

What is the resistance of a 3.5-m length of copper wire 1.5 mm in diameter?

What is the resistance of a $5.4 \mathrm{~m}$ length of copper wire $1.5 \mathrm{~mm}$ in diameter?

Compare the resistance of 10.0 m of aluminum wire 2.0 mm in diameter with 15.0 m of copper filament wire 2.5 mm in diameter.

Consider a metal conductor in the shape of a football (oblong). If it carries a total charge $Q$, where would you expect the charge density $\sigma$ to be greatest, at the ends or along the flatter sides? Explain. [Hint: Near the surface of a conductor, $\left.E=\sigma / \epsilon_0.\right]$

What is the diameter of a 1.00-m length of tungsten wire whose resistance is $0.22~ \Omega?$

Would Gauss’s law be helpful for determining the electric field of a dipole? Why?

Would Gauss's law be helpful in determining the electric field due to an electric dipole?

What is the diameter of a 1.00-m length of tungsten wire whose resistance is $0.32 \Omega ?$

A 50.0-m length of coaxial cable has an inner conductor that has a diameter of 2.58 mm and carries a charge of 8.10 $\mu C$. The surrounding conductor has an inner diameter of 7.27 mm and a charge of −8.10 $\mu C$. Assume the region between the conductors is air. (a) What is the capacitance of this cable? (b) What is the potential difference between the two conductors?

An isolated charged capacitor has horizontal plates. If a thin dielectric is inserted a short way between the plates, Fig. 24-19, will it move left or right when it is released? Explain.

An electric device draws $5.60 \mathrm{~A}$ at $240 \mathrm{~V}$. If the resistance of the device were reduced by $15 \%$, what current would be drawn at $240 \mathrm{~V}$?

What is the resistance of a 3.0-m length of copper wire 1.5 mm in diameter?