25. Electric Potential

In which of the following electric circuits would a voltmeter connected across a resistor read $10 V$?

Suppose six points labeled A through F are placed in the vicinity of a positive point charge, with their distances from the charge given as follows: A is at $1 m$, B at $2 m$, C at $3 m$, D at $4 m$, E at $5 m$, and F at $6 m$. Rank the locations A to F in order of decreasing electric potential (from highest to lowest).

A conducting rod of length $L$ moves with constant velocity $v$ perpendicular to a uniform magnetic field $B$. What is the magnitude $V_{BA}$ of the potential difference between the ends of the rod?

Which of the following best describes electric potential?

If two points are located at distances $r_1$ and $r_2$ from a point charge, what is the ratio $\frac{V_2}{V_1}$ of the electric potentials at these points?

A point charge $Q$ is located at the origin. Two points, a and b, are located at distances $r_a$ and $r_b$ from the charge, respectively, with $r_a<r_b$. Which point has a higher electric potential?

Which component is used to measure the potential difference $V$ across a branch in an electric circuit?

A point charge $q$ is located at the origin. What is the electric potential $V(z)$ on the z-axis as a function of $z$?

A circuit consists of an ideal battery with emf $e$ connected directly across an ideal voltmeter. What is the reading $v$ of the voltmeter? Express your answer in terms of the emf $e$.

A point charge of $q$ is located at a distance $r$ from a point indicated by a dot. What is the electric potential $V$ at the dot due to this charge?

Given two points a and b in an electric field, what is the expression for the potential difference $V_{ab}$ between them?

Which of the following is the SI unit of electrical resistance?

Two equal point charges of $q$ are placed at positions $(0,1)$ and $(0,-1)$ on the $xy$-plane. At what point or points on the $y$-axis is the electric potential zero?