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You Can Shield a Charge from Electrical Forces by Putting It Inside a Hollow Conductor. Can You Shield a Body from the Gravitational Influence of Nearby Matter by Putting It Inside a Hollow Sphere Or by Some Other Means

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प्रश्न

Answer the following:

You can shield a charge from electrical forces by putting it inside a hollow conductor. Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means?

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उत्तर १

No 

Gravitational influence of matter on nearby objects cannot be screened by any means. This is because gravitational force unlike electrical forces is independent of the nature of the material medium. Also, it is independent of the status of other objects.

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उत्तर २

No. Gravitational forces are independent of medium. A body cannot be shielded from the gravitational influence of nearby matter.

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  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 7: Gravitation - Exercises [पृष्ठ २०१]

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एनसीईआरटी Physics Part 1 and 2 [English] Class 11
अध्याय 7 Gravitation
Exercises | Q 1.1 | पृष्ठ २०१

संबंधित प्रश्न

If you compare the gravitational force on the Earth due to the Sun to that due to the Moon, you would find that the Sun’s pull is greater than the Moon’s pull. (You can check this yourself using the data available in the succeeding exercises). However, the tidal effect of the Moon’s pull is greater than the tidal effect of Sun. Why?


Choose the correct alternative:

 Acceleration due to gravity increases/decreases with increasing altitude.


Choose the correct alternative:

Acceleration due to gravity is independent of mass of the earth/mass of the body.


The gravitational intensity at the centre of a hemispherical shell of uniform mass density has the direction indicated by the arrow (see Fig 8.12) (i) a, (ii) b, (iii) c, (iv) 0.


A rocket is fired from the earth towards the sun. At what distance from the earth’s centre is the gravitational force on the rocket zero? Mass of the sun = 2 ×1030 kg, mass of the earth = 6 × 1024 kg. Neglect the effect of other planets etc. (orbital radius = 1.5 × 1011 m).


Suppose the gravitational potential due to a small system is k/r2 at a distance r from it. What will be the gravitational field? Can you think of any such system? What happens if there were negative masses?


The weight of an object is more at the poles than at the equator. Is it beneficial to purchase goods at equator and sell them at the pole? Does it matter whether a spring balance is used or an equal-beam balance is used?


Two small bodies of masses 10 kg and 20 kg are kept a distance 1.0 m apart and released. Assuming that only mutual gravitational forces are acting, find the speeds of the particles when the separation decreases to 0.5 m.


A tunnel is dug along a diameter of the earth. Find the force on a particle of mass m placed in the tunnel at a distance x from the centre.


A solid sphere of mass m and radius r is placed inside a hollow thin spherical shell of mass M and radius R as shown in the following figure . A particle of mass m' is placed on the line joining the two centres at a distance x from the point of contact of the sphere and the shell. Find the magnitude of the resultant gravitational force on this particle due to the sphere and the shell if (a) r < x < 2r, (b) 2r < x < 2R and (c) x > 2R.


Define one Newton. How much maximum acceleration can it produce in a mass of 1 kg?


How will the force of gravitation between two objects change if the distance between them is:
Made four times


Name and state the action and reaction in the following case:
A book lying on a table.


Explain the difference between g and G.


Answer the following question.

State Newton’s law of gravitation and express it in vector form.


The gravitational force between a hollow spherical shell (of radius R and uniform density) and a point mass is F. Show the nature of F vs r graph where r is the distance of the point from the centre of the hollow spherical shell of uniform density.


Give scientific reasons for the following:

Newton's gravitational law is the universal law of gravitation.


Answer the following questions in reference to the figure below:

  1. Which relation is shown in the figure?
  2. What will happen if the mass of one of the objects is doubled?

The acceleration of the Moon towards the Earth is approximately ______.


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