NEET UG PHYSICS MCQ: ELECTRIC FIELDS AND CHARGES

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The electric field required to keep a water drop of mass m just to remain suspended, when charged with one
electron, is

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Correct option: B

\frac{{mg}}{e}

Option B is correct because the electric field is calculated by equating the electric force on the electron to the gravitational force on the water drop.

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The ratio of magnitude of electric displacement (D) and electric field (E) is Gauss’s Law is valid for In hydrogen like system the ratio of coulombian force and gravitational force between an electron and a proton is in the order of: Statement-1:

\overrightarrow{{E}}

in outside velocity of a conductor depends only on the local charge density

\alpha

.
Statement-2:

\overrightarrow{{E}}

in outside vicinity of a conductor is given by

\frac{\sigma}{\varepsilon_0}

. Two charges each of 1 coulomb are at a distance 1

km

apart the force between them is

P \times 10^3

then value of

{P}

is Electric field due to point charge depends on distance

r