Electric Charges Fields And Gausss Law All subtopics
A lithium nucleus contains 3 protons. What is the total positive charge carried by the protons in this nucleus?
Two point charges of +6.0 μC and −4.0 μC are separated by 0.50 m in a vacuum. Calculate the magnitude of the electrostatic force between them.
The separation between two identical point charges is doubled while both charges remain unchanged. Which statement correctly describes the resulting electrostatic force?
A student writes: “The charge of a proton is +1.60 × 10⁻¹⁹ C in the direction away from the nucleus.” Which aspect of this statement is physically incorrect?
Two protons are separated by 2.0 × 10⁻¹⁰ m. Which value is closest to the ratio $F_{\mathrm{E}}$/$F_{\mathrm{g}}$ for this pair?
A rubber rod is brought near a small, neutral, metallic sphere without touching it. The sphere is observed to be attracted toward the rod. Which statement best explains this observation?
Charge $q_{\mathrm{A}}$ = +2.0 μC is at position x = 0 and charge $q_{\mathrm{B}}$ = +2.0 μC is at x = 1.0 m. A third charge $q_{\mathrm{C}}$ = −1.0 μC is placed at x = 0.50 m. What is the net electrostatic force on $q_{\mathrm{C}}$?
Which of the following everyday forces is gravitational, rather than electromagnetic, in origin?
Two point charges, +Q and −Q, are separated by distance d. A third charge +Q is placed at the midpoint between them. Determine the direction of the net force on the third charge.
A neutral insulating rod is placed in a uniform external electric field. Which description best characterizes the response of the rod’s internal charges?
Two point charges +q₁ = +3.0 μC and +q₂ = +3.0 μC are placed 0.20 m apart in a vacuum. The space between them is then filled with a material whose permittivity is ε = 4ε₀. By what factor does the electrostatic force between them change?
An object carries a charge of 4.80 × 10⁻¹⁹ C. How many excess elementary charges does this object have, and what type of charge carrier was removed or added?
Two identical positive point charges q are placed at two vertices of an equilateral triangle with side length d. What is the magnitude of the net electrostatic force on a third identical charge +q placed at the remaining vertex?
A dust particle of mass 1.0 × 10⁻¹⁵ kg carries a charge of +8.0 × 10⁻¹⁹ C. It floats stationary in a uniform electric field, with the electrostatic force exactly balancing its weight. Calculate the magnitude of the electric force on the particle. (Use g = 9.8 m/s².)
Planets exert significant gravitational forces on each other but negligible electrostatic forces, despite the electrostatic force being roughly 10³⁶ times stronger than gravity between individual protons. Which reasoning best explains this observation?
Two point charges, q₁ = +4.0 μC and q₂ = +9.0 μC, are separated by 0.30 m in a vacuum. Calculate the magnitude of the electrostatic force between them.
A physicist claims that an isolated oil droplet carries a charge of 2.40 × 10⁻¹⁹ C. Determine whether this claim is consistent with charge quantization and justify your answer.
A copper sphere and a glass sphere of identical size are each placed in the same external electric field. Which statement correctly compares their responses?
An engineer needs to reduce the electrostatic force between two charged components in a device without changing their charges or separation. She inserts a slab of material with permittivity ε = 3ε₀ between them. The original force in vacuum was 9.0 N. Calculate the new force.
A glass rod is rubbed with a piece of silk and acquires a charge of +12 nC. What is the charge on the silk after this process?