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:
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→
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,
Which of the following reason(s) support(s) the usage of sleepers below the rails?
(A) To reduce the pressure
(B) To increase the normal reaction
(C) To increase the surface area
(D) To accommodate the thermal expansion/contraction of the rails Continue reading Sleepers Below the Rails→
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