KEAM Electric Potential — practice questions

Explore 2 free Electric Potential questions in KEAM Physics. Open each question or exercise to read its content, reference answers and available explanation.

Practise Electric Potential with Quill →

Electric Potential questions and exercises with answers

Showing questions 1–2 of 2.

Electrostatic potential due to a point charge $q$ at distance $r$ in vacuum is:Read the answer and worked solution →Work done in moving a 6 C charge between two points raises the system's potential energy by 120 J. If the starting potential is 10 V, the final potential is:Read the answer and worked solution →

Worked practice questions

Electrostatic potential due to a point charge $q$ at distance $r$ in vacuum is:

$\dfrac{q r}{4\pi\varepsilon_0}$
$\dfrac{q}{4\pi\varepsilon_0 r^3}$
$\dfrac{1}{4\pi\varepsilon_0}\dfrac{q}{r}$
$\dfrac{1}{4\pi\varepsilon_0}\dfrac{q}{r^2}$

Show answer and solution

Correct answer: C. $\dfrac{1}{4\pi\varepsilon_0}\dfrac{q}{r}$

Potential V is the work per unit charge to bring a unit positive charge from infinity to the point: $V = q/(4\pi\varepsilon_0 r)$. The $1/r^2$ form is the field E, not V.

Open this question →

Work done in moving a 6 C charge between two points raises the system's potential energy by 120 J. If the starting potential is 10 V, the final potential is:

20 V
30 V
130 V
120 V

Show answer and solution

Correct answer: B. 30 V

$V_B - V_A = W_{AB}/q = 120/6 = 20$ V, so $V_B = 10 + 20 = 30$ V.