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NEET UG 2025Physics Electrostatics

easy
mcq
2025
Official previous-year question

Verified 30 May 2026.

Question

The electric potential at distance $r$ from a point charge $q$ is $V = \frac{q}{4\pi\varepsilon_0 r}$. The electric field $E$ is:

Options

  1. A

    $E = -\frac{dV}{dr} = \frac{q}{4\pi\varepsilon_0 r^2}$

  2. B

    $E = \frac{dV}{dr} = -\frac{q}{4\pi\varepsilon_0 r^2}$

  3. C

    $E = \frac{q}{4\pi\varepsilon_0 r}$

  4. D

    $E = \frac{q^2}{4\pi\varepsilon_0 r^2}$

Solution

$$E = -\frac{dV}{dr} = -\frac{d}{dr}\left(\frac{q}{4\pi\varepsilon_0 r}\right) = \frac{q}{4\pi\varepsilon_0 r^2}$$

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