A) \[2\pi rT+W\]
B) \[2\pi rT\cos \theta -W\]
C) \[\text{2}\pi \text{rTcos}\theta +W\]
D) \[W-2\pi rT\cos \theta \]
Correct Answer: C
Solution :
Weight of metal disc = total upward force = upthrust force + force due to surface tension = weight of displaced water \[+Tcos\theta (2\pi r)\] \[=W+2\pi rTcos\theta \]You need to login to perform this action.
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