JEE Main 2020 (Online) 9th January Morning Slot | Electrostatics Question 95 | Physics

JEE Main 2020 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

Consider a sphere of radius R which carries a uniform charge density $$\rho $$. If a sphere of radius $${{R \over 2}}$$ is carved out of it, as shown, the ratio $${{\left| {\overrightarrow {{E_A}} } \right|} \over {\left| {\overrightarrow {{E_B}} } \right|}}$$ of magnitude of electric field $${\overrightarrow {{E_A}} }$$ and $${\overrightarrow {{E_B}} }$$, respectively, at points A and B due to the remaining portion is : JEE Main 2020 (Online) 9th January Morning Slot Physics - Electrostatics Question 96 English

JEE Main 2020 (Online) 9th January Morning Slot Physics - Electrostatics Question 96 English

$${{17} \over {54}}$$

$${{18} \over {54}}$$

$${{18} \over {34}}$$

$${{21} \over {34}}$$

JEE Main 2020 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

An electric dipole of moment
$$\overrightarrow p = \left( { - \widehat i - 3\widehat j + 2\widehat k} \right) \times {10^{ - 29}} $$ C.m is
at the origin (0, 0, 0). The electric field due to this dipole at
$$\overrightarrow r = + \widehat i + 3\widehat j + 5\widehat k$$ (note that $$\overrightarrow r .\overrightarrow p = 0$$ ) is parallel to :

$$\left( { + \widehat i + 3\widehat j - 2\widehat k} \right)$$

$$\left( { + \widehat i - 3\widehat j - 2\widehat k} \right)$$

$$\left( { - \widehat i + 3\widehat j - 2\widehat k} \right)$$

$$\left( { - \widehat i - 3\widehat j + 2\widehat k} \right)$$

JEE Main 2020 (Online) 8th January Evening Slot

MCQ (Single Correct Answer)

-1

A particle of mass m and charge q is released from rest in a uniform electric field. If there is no other force on the particle, the dependence of its speed v on the distance x travelled by it is correctly given by (graphs are schematic and not drawn to scale)

JEE Main 2020 (Online) 8th January Evening Slot Physics - Electrostatics Question 98 English Option 1

JEE Main 2020 (Online) 8th January Evening Slot Physics - Electrostatics Question 98 English Option 2

JEE Main 2020 (Online) 8th January Evening Slot

MCQ (Single Correct Answer)

-1

Consider two charged metallic spheres S₁ and S₂ of radii R₁ and R₂, respectively. The electric fields E₁ (on S₁) and E₂ (on S₂) on their surfaces are such that E₁/E₂ = R₁/R₂. Then the ratio V₁ (on S₁) / V₂ (on S₂) of the electrostatic potentials on each sphere is :

(R₁/R₂)²

(R₂/R₁)

(R₁/R₂)³

R₁/R₂

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