The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerin becomes constant after some time. If the density of glycerin is $\frac {d}{2}$, then the viscous force acting on the ball will be:
(1) $\frac {Mg}{2}$
(2) $Mg$
(3) $\frac {3}{2} Mg$
(4) $2Mg$ Continue reading The velocity of a small ball of mass M and density d ….
Two charged spherical conductors of radius $R_1$ and $R_2$ are connected by wire. Then the ratio of surface charge densities of the spheres $\frac {\sigma_1}{\sigma_2}$ is:
(1) $\frac {R_1}{R_2}$
(2) $\frac {R_2}{R_1}$
(3) $\sqrt \frac {R_1}{R_2}$
(4) $\sqrt \frac {R_2}{R_1}$ Continue reading Two charged spherical conductors of radius $R_1$ and $R_2$ ….
Find the value of the angle of emergence from the prism. Refractive index of the glass is $\sqrt 3$.
(1) $60^{\circ}$
(2) $30^{\circ}$
(3) $45^{\circ}$
(4) $90^{\circ}$ Continue reading Find the value of the angle of emergence ….
Quantization of charge is a fundamental principle in physics that describes the fact that electric charge is always observed in discrete, quantized amounts. This means that the charge of any object or system can only take on certain specific values, which are always integer multiples of a fundamental unit of charge. Continue reading Quantization of Charge
Here are the main differences between sound waves and light waves: Continue reading Sound Waves Vs Light Waves
A small object of mass m is projected vertically upwards. Its rate of change of momentum $\frac {dp_y}{dt}$ at some instant as it moves upwards ignoring air resistance is given by,
(A) mg
(B) -mg
(C) 0
(D) 2mg
