Force Due to Surface Tension
Category : JEE Main & Advanced
If a body of weight W is placed on the liquid surface, whose surface tension is T. If F is the minimum force required to pull it away from the water then value of F for different bodies can be calculated by the following table.
| Body | Figure | Force |
|
Needle (Length \[=l\]) |
 |
\[F=2lTW\] |
|
Hollow disc (Inner radius \[={{r}_{1}}\] Outer radius \[={{r}_{2}}\]) |
 |
\[F=2\pi ({{r}_{1}}+{{r}_{2}})T+W\] |
| Thin ring (Radius \[=r\]) |  |
\[F=2\pi (r+r)T+W\] \[F=4\pi rT+W\] |
|
Circular plate or disc (Radius \[=r\]) |
 |
\[F=2\pi rT+W\] |
|
Square frame (Side = l ) |
 |
F = 8l T + W |
| Square plate |  |
F = 4l T + W |
You need to login to perform this action.
You will be redirected in
3 sec
