WB JEE 2021 | Electrostatics Question 13 | Physics

WB JEE 2021

MCQ (Single Correct Answer)

-0.25

Three infinite plane sheets carrying uniform charge densities $$-$$ $$\sigma$$, 2$$\sigma$$, 4$$\sigma$$ are placed parallel to XZ-plane at Y = a, 3a, 4a respectively. The electric field at the point (0, 2a, 0) is

$${{5\sigma } \over {2{\varepsilon _0}}}\widehat j$$

$$ - {{7\sigma } \over {2{\varepsilon _0}}}\widehat j$$

$${\sigma \over {2{\varepsilon _0}}}\widehat j$$

$${{5\sigma } \over { - 2{\varepsilon _0}}}\widehat j$$

WB JEE 2021

MCQ (Single Correct Answer)

-0.25

Two point charges +q₁ and +q₂ are placed a finite distance d apart. It is desired to put a third charge q₃ in between these two charges, so that q₃ is in equilibrium. This is

possible only if q₃ is negative.

possible only if q₃ is positive.

possible irrespective of the sign of q₃.

not possible at all.

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

As shown in the figure, a point charge q₁ = + 1 $$ \times $$ 10^-6 C is placed at the origin in xy-plane and another point charge q₂ = + 3 $$ \times $$ 10^-6 C is placed at the coordinate (10, 0).

WB JEE 2020 Physics - Electrostatics Question 27 English

WB JEE 2020 Physics - Electrostatics Question 27 English

In that case, which of the following graph(s) shows most correctly the electric field vector in E_x in x-direction?

WB JEE 2020 Physics - Electrostatics Question 27 English Option 1

WB JEE 2020 Physics - Electrostatics Question 27 English Option 2

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

Four identical point masses, each of mass m and carrying charge + q are placed at the corners of a square of sides a on a frictionless plane surface. If the particles are released simultaneously, the kinetic energy of the system when they are infinitely far apart is

$${{{q^2}} \over a}(2\sqrt 2 + 1)$$

$${{{q^2}} \over a}(\sqrt 2 + 2)$$

$${{{q^2}} \over a}(\sqrt 2 + 4)$$

$${{{q^2}} \over a}(\sqrt 2 + 1)$$

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