SATHEE: Electrostatics Question 372

Electrostatics Question 372

Question: In Millikan’s oil drop experiment an oil drop carrying a charge Q is held stationary by a potential difference $2400 V$ between the plates. To keep a drop of half the radius stationary the potential difference had to be made $600 V$ . What is the charge on the second drop [MP PET 1997]

Options:

A) $\frac{Q}{4}$

B) $\frac{Q}{2}$

C) $Q$

D) $\frac{3 Q}{2}$

Show Answer

Answer:

Correct Answer: B

Solution:

In balance condition therefore $Q E = m g$

therefore $Q \frac{V}{d} = (\frac{4}{3} π r^{3} ρ) g$

therefore $Q \propto \frac{r^{3}}{V}$

therefore $\frac{Q_{1}}{Q_{2}} = {(\frac{r_{1}}{r_{2}})}^{3} \times \frac{V_{2}}{V_{1}}$

therefore $\frac{Q}{Q_{2}} = {(\frac{r}{r / 2})}^{3} \times \frac{600}{2400} = 2$

therefore Q2 = Q / 2

Electrostatics Question 372

Question: In Millikan’s oil drop experiment an oil drop carrying a charge Q is held stationary by a potential difference $2400 V$ between the plates. To keep a drop of half the radius stationary the potential difference had to be made $600 V$ . What is the charge on the second drop [MP PET 1997]

Options:

Answer:

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Electrostatics Question 372

Question: In Millikan’s oil drop experiment an oil drop carrying a charge Q is held stationary by a potential difference 2400V between the plates. To keep a drop of half the radius stationary the potential difference had to be made 600V . What is the charge on the second drop [MP PET 1997]

Options:

Answer:

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Menu

Question: In Millikan’s oil drop experiment an oil drop carrying a charge Q is held stationary by a potential difference $2400 V$ between the plates. To keep a drop of half the radius stationary the potential difference had to be made $600 V$ . What is the charge on the second drop [MP PET 1997]