KCET 2022 | Electrostatics Question 7 | Physics

Four charges $$+q_1+2 q_1+q$$ and $$-2 q$$ are placed at the corners of a square $$A B C D$$ respectively. The force on a unit positive charge kept at the centre $$O$$ is

along the diagonal $$B D$$

along the diagonal $$A C$$

perpendicular to $$A D$$

zero

KCET 2022

MCQ (Single Correct Answer)

-0

An electric dipole with dipole moment $$4 \times 10^{-19} \mathrm{C}-\mathrm{m}$$ is aligned at $$30^{\circ}$$ with the direction of a uniform electric field of magnitude $$5 \times 10^4 \mathrm{NC}^{-1}$$, the magnitude of the torque acting on the dipole is

$$\sqrt{3} \times 10^{-4} \mathrm{~N}-\mathrm{m}$$

$$10^{-5} \mathrm{~N}-\mathrm{m}$$

$$10 \times 10^{-3} \mathrm{~N}-\mathrm{m}$$

$$10^{-4} \mathrm{~N}-\mathrm{m}$$

KCET 2022

MCQ (Single Correct Answer)

-0

A charged particle of mass $$m$$ and charge $$q$$ is released from rest in an uniform electric field E. Neglecting the effect of gravity, the kinetic energy of the charged particle after $$t$$ seconds is

$$\frac{E q^2 m}{2 t^2}$$

$$\frac{E q m}{t}$$

$$\frac{E^2 q^2 t^2}{2 m}$$

$$\frac{2 E^2 t^2}{m q}$$

KCET 2022

MCQ (Single Correct Answer)

-0

The electric field and the potential of an electric dipole vary with distance $$r$$ as

$$\frac{1}{r^2}$$ and $$\frac{1}{r}$$

$$\frac{1}{r^2}$$ and $$\frac{1}{r^3}$$

$$\frac{1}{r^3}$$ and $$\frac{1}{r^2}$$

$$\frac{1}{r}$$ and $$\frac{1}{r^2}$$

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