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Grade: 12
        

What is the gravaitaional field?

9 years ago

Answers : (1)

askIITIians Expert
21 Points
							

Gravitational Field

We say that a body A exerts a force of gravitation on another body B kept at a distance. This is called action at  a distance viewpoint. However, this viewpoint creates certain problems when one deals with objects separated by large distances. It is now assumed that a body can not directly interact with another body kept at a distance. The force between two objects is seen to be two-step process.

Int he first step, it is assumed that the body A creates a gravitational field in the space around it. The field has its own existence and has energy and momentum. his field has a definite direction at each point of the space and its intensity varies from point to point.

In the second step, it is assumed that when a body B is placed in a gravitational field, this field exerts a force on it. The direction and the intensity of the field is defined in temrs of the force it exerts on a body placed in it. We define the intensity of gravitational field E at a point by the equation.

E = F/m

where F is the force exerted by the field on a body of mass m placed in the field. Quiet often the intensity of gravitational field is abbreviated as gravitational field. Its SI unit is N/kg

9 years ago
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