COMEDK 2026 Afternoon Shift | Electrostatics Question 6 | Physics

A pith ball of mass ' $m$ ' gram and charge ' $Q$ ' is suspended using a mass less silk thread near a large charged conducting metal sheet of area ' $A$ ' and surface charged density ' $\sigma$ '. If the silk thread makes an angle $\Theta$ with the metal sheet, then:

$\tan \theta \propto \sigma$

$\tan \theta \propto A$

$\tan \theta \propto m g$

$\tan \theta \propto \frac{1}{\sigma}$

COMEDK 2026 Morning Shift

MCQ (Single Correct Answer)

-0

COMEDK 2026 Morning Shift Physics - Electrostatics Question 8 English

Two charges 1 C and 2 C are placed at coordinates $(0,3)$ and $(4,3)$ respectively in an XY plane. What is the work done to put a 30 C charge at the origin of the coordinate system?

$1.98 \times 10^9 \mathrm{~J}$

$198 \times 10^9 J$

$19.8 \times 10^9 J$

$3.98 \times 10^9 \mathrm{~J}$

COMEDK 2026 Morning Shift

MCQ (Single Correct Answer)

-0

Two-point charges of equal magnitude 0.01 C and opposite in sign are separated by 0.2 mm , forming an electric dipole. The electric dipole moment of the dipole is:

$2 \times 10^{-3} \mathrm{Cm}$ along the line joining the two charges and the direction of the dipole moment vector is from negative to positive 0.01 C

$4 \times 10^{-6} \mathrm{Cm}$ along the line joining the two charges and the direction of the dipole moment vector is from positive to negative 0.01 C

$2 \times 10^{-6} \mathrm{Cm}$ along the line joining the two charges and the direction of the dipole moment vector is from negative to positive 0.01 C

$2 \times 10^6 \mathrm{Cm}$ along the line joining the two charges and the direction of the dipole moment vector is from positive to negative 0.01 C

COMEDK 2026 Morning Shift

MCQ (Single Correct Answer)

-0

Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of $45^{\circ}$ with each other. When the system is immersed in a liquid of relative density 0.8 , the angle between the strings remains unchanged. If the density of the material of the sphere is $2.4 \mathrm{gcm}^{-3}$, what is the dielectric constant of the liquid?

1.6

1.5

0.5

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