NEET UG PHYSICS MCQ: ELECTRIC FIELDS AND CHARGES

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Three equal charges Q each are placed at the vertices of an equilateral triangle of side

l

. How much work has to be done in bringing them closer to an equilateral triangle of side

\frac{l}{2}

View answer and explanation

Correct option: B

\frac{{3{Q^2}}}{{4\pi {\varepsilon _0}l}}

Option B (

\frac{{3{Q^2}}}{{4\pi {\varepsilon _0}l}}

) is correct because the work done is the change in potential energy of the system, which is calculated by considering the interactions between all pairs of charges.

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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