SATHEE: Electrostatics 5 Question 29

Electrostatics 5 Question 29

31. For the circuit shown, which of the following statements is true?

(1999, 2M)

(a) With $S_{1}$ closed, $V_{1} = 15 V, V_{2} = 20 V$

(b) With $S_{3}$ closed, $V_{1} = V_{2} = 25 V$

(d) With $S_{3}$ closed, $V_{1} = 30 V, V_{2} = 20 V$

Show Answer

Answer:

Correct Answer: 31. (d)

Solution:

When $S_{3}$ is closed, due to attraction with opposite charge, no flow of charge takes place through $S_{3}$ . Therefore, potential difference across capacitor plates remains unchanged or $V_{1} = 30 V$ and $V_{2} = 20 V$ .

Alternate Solution

Charges on the capacitors are

$q_{1} = (30) (2) = 60 pC$

and $q_{2} = (20) (3) = 60 pC$ or $q_{1} = q_{2} = q$ (say)

The situation is similar as the two capacitors in series are first charged with a battery of emf $50 V$ and then disconnected.

$∴$ When $S_{3}$ is closed,

$and V_{2} = 20 V .$

Electrostatics 5 Question 29

31. For the circuit shown, which of the following statements is true?

Answer:

Solution:

Alternate Solution

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Electrostatics 5 Question 29

31. For the circuit shown, which of the following statements is true?

Answer:

Solution:

Alternate Solution

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Menu