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Force necessary to pull a circular plate of 5 cm radius from water surface for which surface tension is 75 dynes/cm,is
  • a)
    30 dynes
  • b)
    60 dynes
  • c)
    750 dynes
  • d)
    750π dynes
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Force necessary to pull a circular plate of 5 cm radius from water sur...
Surface tension = force/ length
Given: radius = 5 cm
So circumference of plate is 2*π*5 cm
Now, 75=force/2π*5 Force 750 π dyne.
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Most Upvoted Answer
Force necessary to pull a circular plate of 5 cm radius from water sur...
The force necessary to pull a circular plate from the water surface is given by the formula:

F = 2πrT

where F is the force required, r is the radius of the circular plate, and T is the surface tension.

Substituting the given values, we get:

F = 2π(5)75
F = 750 dynes

Therefore, the correct option is (d) 750 dynes.
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