Click to Chat

1800-2000-838

+91-120-4616500

CART 0

• 0

MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
`        explain  solid angle in detail ?`
6 years ago

105 Points
```										Dear singh,
The solid angle, Ω, is the two-dimensional angle in three-dimensional space that an object subtends at a point. It is a measure of how large that object appears to an  observer looking from that point. A small object nearby may subtend the  same solid angle as a larger object farther away (for example, the  small/near Moon can totally eclipse the large/remote Sun because, as  observed from a point on the Earth, both objects fill almost exactly the  same amount of sky). An object's solid angle is equal to the area of the segment of unit sphere (centered at the vertex of the angle) restricted by the object (this definition works in any  dimension, including 1D and 2D). A solid angle equals the area of a  segment of unit sphere in the same way a planar angle equals the length of an arc of unit circle.

The units of solid angle can be called steradian (abbreviated "sr") according to SI.  From the point of view of mathematics and physics solid angle is  dimensionless and has no units, thus "sr" might be skipped in scientific  texts. The solid angle of a sphere measured from a point in its  interior is 4π sr, and the solid angle subtended at the center of a cube by one of its  faces is one-sixth of that, or 2π/3 sr. Solid angles can also be  measured in square degrees (1 sr = (180/π)2 square degree) or in fractions of the sphere (i.e., fractional area), 1 sr = 1/4π fractional area.
One way to determine the fractional area subtended by a spherical  surface is to divide the area of that surface by the entire surface area  of the sphere. The fractional area can then be converted to steradian  or square degree measurements by the following formulae:

To obtain the solid angle in steradians, multiply the fractional area by 4π.
To obtain the solid angle in square degrees, multiply the fractional area by 4π × (180/π)2, which is equal to 129600/π.

All the best.
Win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.

Suryakanth –IITB

```
6 years ago
Think You Can Provide A Better Answer ?

## Other Related Questions on Electrostatics

View all Questions »
• Complete Physics Course - Class 12
• OFFERED PRICE: Rs. 2,756
• View Details
• Complete Physics Course - Class 11
• OFFERED PRICE: Rs. 2,968
• View Details