Questions in "Physics"

two circular coils A and B are placed close to each other.If the current in col A is changed will some current be induced in the coil B? give reason

If the current in the coil A is changed then some current will definitely be induced in the coil B. When the current in coil A is changed, the magnetic field associated with it also changes. As a result, the magnetic field around coil B also changes. This change in magnetic field lines around coil B induces an electric current in it. This process is known electromagnetic induction.

What exactly is the Raman Effect?

A change of wavelength exhibited by some of the radiation scattered in a medium. The effect is specific to the molecules which cause it, and so can be used in spectroscopic analysis.

Name the principle on which a rocket works.

A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum. Due to the principle of conservation of momentum the body of the rocket is pushed forward. If both the momentum of the gases as well as that of the rocket are added the sum is zero.

Define potential energy. Write the SI unit of potential energy. Derive an expression for potential energy.

Potential energy

The energy of a body due to its position or change in shape is known as Potential Energy.
Derivation
Suppose a body of mass m is raised to a height h above the surface of the earth. The force acting on the body is the gravitational pull of the earth m × g which acts in the downward direction. To lift the body above the surface of the earth, we have to do work against this force of gravity,
Now,
Workdone = Force × Distace
So, W = m × g × h
This work gets ...

Why cant man walk in space?

In space, astronauts do not walk on the floor like people on Earth do. They float around inside their spacecraft. That is because of micro gravity. Micro gravity is when things seem to be weightless. "Micro-" means "very small." Micro gravity is when the pull of gravity is not very strong. In micro gravity, it is easy to move heavy objects. Astronauts can even move things that weigh hundreds of pounds with just the tips of their fingers. Gravity is what pulls people down toward Earth. When you jump, gravity makes you come back down. When you are walking, it ...

Why are oceans are blue in colour?

The ocean looks blue because red, orange and yellow (long wavelength light) are absorbed more strongly by water than is blue (short wavelength light). So when white light from the sun enters the ocean, it is mostly the blue that gets returned.When light strikes water, like sunlight, the water filters the light so that red is absorbed and some blue is reflected. Blue also travels further through water than light with longer wavelengths (red, yellow, green) though very little light reaches deeper than 200 meters (656 feet), and no light at all penetrates beyond 2,000 meters (3,280 feet). Another reason ...

What is motion and time?

Time is a phenomenon by which human beings observe and record changes in the environment and the universe.The knowledge of time and its measurement is very important.The standard unit(S.I.) unit of time is second(s). When a body changes its position with respect to its surroundings,it is said to be in motion. For example,when the position of a car changes continously with respect to stationary objects like houses and trees,etc.,we say that the car is moving or that the car is in motion.

Search

Solved Questions

Question of the week

What is the valency of carbon?

Question Asked Nov. 17, 2016, 6:19 p.m. by Abhinav

Welcome to Schoolessons

Ask A Teacher