COMEDK 2025 Evening Shift | Electrostatics Question 1 | Physics

A bob of a simple pendulum has a mass of 4 g and a charge of $20 \mu \mathrm{C}$. If it is at rest in a uniform horizontal electric field of intensity $1000 \mathrm{Vm}^{-1}$, the angle that the pendulum makes with the vertical at equilibrium is:

$\tan ^{-1} \frac{1}{2}$

$60^{\circ}$

$30^{\circ}$

$\tan ^{-1} 2$

COMEDK 2025 Evening Shift

MCQ (Single Correct Answer)

-0

Three charges, $Q,-q$ and $2 q$ are placed at the vertices of a right-angled isosceles triangle. What is the value of $q$ for the net electrostatic energy of the configuration to be zero?

COMEDK 2025 Evening Shift Physics - Electrostatics Question 1 English

$Q\left[\frac{1}{2 \sqrt{2}}-1\right]$

$Q\left[1-\frac{1}{2 \sqrt{2}}\right]$

$Q\left[1+\frac{1}{2 \sqrt{2}}\right]$

$Q\left[\frac{2 \sqrt{2}+1}{2}\right]$

COMEDK 2025 Evening Shift

MCQ (Single Correct Answer)

-0

A particle of mass 3 g and charge $60 \mu \mathrm{C}$ is released from rest in a uniform electric field of intensity $10^5 N C^{-1}$. If the value of kinetic energy attained by the particle after moving through a distance of 2 cm is $m \times 10^{-2} J$, then the value of m is:

COMEDK 2025 Evening Shift

MCQ (Single Correct Answer)

-0

A uniformly charged conducting sphere of 0.2 m diameter has a surface charge density of $70 \mu \mathrm{Cm}^{-2}$. The electric flux leaving the surface of the sphere is:

$9.9 \times 10^5 \mathrm{~N} \mathrm{C}^{-1} \mathrm{~m}^2$

$9.9 \times 10^6 \mathrm{~N} \mathrm{C}^{-1} \mathrm{~m}^2$

$8.9 \times 10^5 \mathrm{~N} \mathrm{C}^{-1} \mathrm{~m}^2$

$8.9 \times 10^6 \mathrm{~N} \mathrm{C}^{-1} \mathrm{~m}^2$

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