24. Electric Force & Field; Gauss' Law

Which of these materials is an insulator?

Which of the following symbols represents a DC voltage source in a circuit schematic?

Which of the following best explains whether an object can be charged negatively using a positively charged object?

Which of the following configurations would produce an $\mathrm{electric} \mathrm{current}$?

Which of the following statements regarding electric insulators is correct?

A conducting sphere with a diameter of $4.00cm$ is charged so that its electric potential is $50V$ relative to infinity. What is the total charge on the sphere? (Assume the sphere is isolated in air, and use $\epsilon 0_0$ for the permittivity of free space.)

Which change increases the electric force between two charged objects according to $\mathrm{Coulomb}’s\mathrm{law}$?

Which of the following best describes the electrical charge of a neutron?

If three identical light bulbs, each with resistance $r$, are connected in series to a battery with emf $e$ and negligible internal resistance, what is the current flowing through the circuit?

Which electrical device allows current ($I$) to flow in only one direction?

In a cathode ray tube, why do $e-$ (electrons) move from the negative end (cathode) to the positive end (anode)?

Which type of force can be produced by an $\mathrm{electrical} \mathrm{current}$?

If a charged particle moves perpendicular to a uniform magnetic field and experiences a magnetic force of $3.5\times {10}^{-2}$ N, which of the following could be the value of the charge if the particle's velocity is $2.0\times {10}^6$ m/s and the magnetic field strength is $0.05$ T?

In an AC circuit with a resistor of resistance $R$ and a capacitor of capacitance $C$ connected in series to a voltage source $V=V_{0}sin\left(\omega t\right)$, what is the amplitude $i_0$ of the total current $i\left(t\right)$ in the circuit?

When two $\mathrm{negative}$ charges are brought close together, what type of interaction will occur between them?