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When liquid medicine of density ρ is to put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.
Q. After the drop detaches, its surface energy is
  • a)
    1.4 × 10–6 J
  • b)
    2.7 × 10 –6 J
  • c)
    5.4 × 10–6 J
  • d)
    8.1 × 10 –6J
Correct answer is option 'B'. Can you explain this answer?
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When liquid medicine of density ρ is to put in the eye, it is done...

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When liquid medicine of density ρ is to put in the eye, it is done...
Surface Energy Calculation
- The net vertical force due to surface tension is given by the formula: F = 2πRσ, where σ is the surface tension.
- When the force F becomes equal to the weight of the drop mg, the drop gets detached from the dropper.
- Equating the two forces, we get: 2πRσ = mg.

Calculating Surface Energy
- The surface energy of the drop can be calculated using the formula for surface energy: E = 4πR2σ.
- Substituting the value of R from the force equation, we get: E = 4π(σmg/2πσ)σ = 2σmg.
- Given that the weight of the drop is mg and the surface tension is σ, the surface energy E = 2σmg.
Therefore, the surface energy of the drop after detaching from the dropper is 2σmg, which is equal to 2.7 × 10^−6 J. Hence, the correct answer is option B.
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When liquid medicine of density ρ is to put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.Q.After the drop detaches, its surface energy isa)1.4 × 10–6 Jb)2.7 × 10 –6 Jc)5.4 × 10–6 Jd)8.1 × 10 –6JCorrect answer is option 'B'. Can you explain this answer?
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When liquid medicine of density ρ is to put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.Q.After the drop detaches, its surface energy isa)1.4 × 10–6 Jb)2.7 × 10 –6 Jc)5.4 × 10–6 Jd)8.1 × 10 –6JCorrect answer is option 'B'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about When liquid medicine of density ρ is to put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.Q.After the drop detaches, its surface energy isa)1.4 × 10–6 Jb)2.7 × 10 –6 Jc)5.4 × 10–6 Jd)8.1 × 10 –6JCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for When liquid medicine of density ρ is to put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.Q.After the drop detaches, its surface energy isa)1.4 × 10–6 Jb)2.7 × 10 –6 Jc)5.4 × 10–6 Jd)8.1 × 10 –6JCorrect answer is option 'B'. Can you explain this answer?.
Solutions for When liquid medicine of density ρ is to put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.Q.After the drop detaches, its surface energy isa)1.4 × 10–6 Jb)2.7 × 10 –6 Jc)5.4 × 10–6 Jd)8.1 × 10 –6JCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free.
Here you can find the meaning of When liquid medicine of density ρ is to put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.Q.After the drop detaches, its surface energy isa)1.4 × 10–6 Jb)2.7 × 10 –6 Jc)5.4 × 10–6 Jd)8.1 × 10 –6JCorrect answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of When liquid medicine of density ρ is to put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.Q.After the drop detaches, its surface energy isa)1.4 × 10–6 Jb)2.7 × 10 –6 Jc)5.4 × 10–6 Jd)8.1 × 10 –6JCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for When liquid medicine of density ρ is to put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.Q.After the drop detaches, its surface energy isa)1.4 × 10–6 Jb)2.7 × 10 –6 Jc)5.4 × 10–6 Jd)8.1 × 10 –6JCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of When liquid medicine of density ρ is to put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.Q.After the drop detaches, its surface energy isa)1.4 × 10–6 Jb)2.7 × 10 –6 Jc)5.4 × 10–6 Jd)8.1 × 10 –6JCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice When liquid medicine of density ρ is to put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.Q.After the drop detaches, its surface energy isa)1.4 × 10–6 Jb)2.7 × 10 –6 Jc)5.4 × 10–6 Jd)8.1 × 10 –6JCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice JEE tests.
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