KCET 2022 | Electrostatics Question 21 | Physics

An electric dipole with dipole moment $$4 \times 10^{-9} \mathrm{C}-\mathrm{m}$$ 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 $$\frac{1}{r^2}$$

KCET 2022

MCQ (Single Correct Answer)

-0

Two tiny spheres carrying charges $$1.8 \mu \mathrm{C}$$ and $$2.8 \mu \mathrm{C}$$ are located at $$40 \mathrm{~cm}$$ apart. The potential at the mid - point of the line joining the two charges is

$$2.1 \times 10^5 \mathrm{~V}$$

$$3.6 \times 10^5 \mathrm{~V}$$

$$1.3 \times 10^4 \mathrm{~V}$$

$$3.8 \times 10^4 \mathrm{~V}$$

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