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In order to identify the charge of a body we should use a charged electroscope. Let us say the electroscope is negatively charged. Now bring the unknown charged body 'X' near the cap of the electroscope. If the leaves diverge more the charge in 'X' must be negative. Suppose that the leaves..

Place a Bunsen burner on its broad base (figure below). Push the top to one side and see what happens. You will notice that the burner does not fall off unless it is given a hard push. This is because the body is in stable equilibrium, it has a broad base, a heavy bottom, thus lowering its center ..

The amplitude-modulated band (AM band) contains the radio waves having frequency of less than 30 MHz or having wavelength of 10 m or more. The lower atmosphere is more or less transparent to radio waves. However, the ionosphere reflects back the radio waves. Thus, a signal emitted by an ..

Space Waves - Space waves travel in (more or less) straight lines. But they depend on line-of-sight conditions. So, they are limited in their propagation by the curvature of the Earth, except in very unusual circumstances. Thus, they propagate very much like electromagnetic waves in free ..

The ratio of the length of the wires to the separation between them is large (more than 300). Therefore, one can estimate the approximate force on a section of either of the two wires (near their centres) by using the exact result for force per unit length for two infinitely long wires c..

X-Rays follow a rectilinear propagation and travel with a velocity of 3 x 10 8 ms - 1 in vacuum. They are not deflected by electric and magnetic field. Since they do not contain any charge but are diffracted by crystals, X-rays cause fluorescence when incident on certain materials such as barium..

Vectors - Introduction - A change of position of a particle is called displacement. If a particle moves from a position A to a position B, as shown in the figur..

The skip distance is the shortest distance from a transmitter, measured along the surface of the Earth, at which a sky wave of fixed frequency (more than f c ) will be returned to Earth. One expects there to be a maximum distance, as limited by the curvature of the Earth, but nevertheless..

A seconds pendulum is a pendulum which takes 2 seconds for one oscillation. Experiment : Simple Pendulum Experiment Aim : To prove that T l. Procedure : Tie the hook of the bob on one end of a thread (more than 1 meter). Clamp the other end firmly between the gap of a split..

>Most stimulated emission photons initially produced in the discharge tube will not happen to be parallel to the tube axis. These will be quickly stopped at the walls. Stimulated emission photons that are parallel to the axis, can move back and forth through the discharge tube many times by success..