Question

Centre of gravity of the circular ring will be
$A.$ At the periphery
$B.$ At the center.
$C.$ Outside it.
$D.$ None

Answer 1

Hint: Centre of gravity of an object is a point at which the weight of the object is considered to act. The Centre of gravity is very important as it predicts the behavior of the moving body. Different objects have different points as the center of gravity.

Complete answer:
The Centre of gravity of a body is defined as the point at which its weight is supposed to be concentrated or acted. In other words, the center of gravity of a body is defined as the point at which the distribution of weight is equal in all directions.
The Centre of gravity of a circular ring will be at its geometric center.
Hence, option $(B)$ is correct.

Additional Information:
We should know the basic difference between the center of gravity and the center of mass. The Centre of the mass of a body is defined as the point at which the distribution of mass is equal in all directions.
- Center of gravity of a body is defined as the point at which the distribution of weight is equal in all directions.
- Centre of the mass of a body is defined as the point at which the distribution of mass is equal in all directions.
- The Centre of mass does not depend on the gravitational field but the center of gravity does depend on the gravitational field.
- The Centre of mass and center of gravity of a body in a uniform gravitational field is always equal but they may be at different points if the gravitational field is not uniform.

Note: We should know that it is a theoretical point not experimental. Weight is supposed to be concentrated at the center of gravity. We should be clear about our concept of center of mass and center of gravity. Different bodies with different geometric shapes have different points as the center of gravity.