Class 12 Physics CBSE Electric Potential & Capacitance Board Questions
Here we provide Class 12 Physics important notes,board questions and predicted questions with Answers for chapter Electric Potential & Capacitance. These important notes,board questions and predicted questions are based on CBSE board curriculum and correspond to the most recent Class 12 Physics syllabus. By practising these Class 12 materials, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 12 Board examinations.
Class 12 CBSE Electric Potential & Capacitance Board Questions
Electric Potential & Capacitance Board Questions
2017
Q1
Predict the polarity of the capacitor in the situation described below :
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Q2
Two identical parallel plate capacitors A and B are connected to a battery of V volts with the
switch S closed. The switch is now opened and the free space between the plates of the capacitors is
filled with a dielectric of dielectric constant K. Find the ratio of the total electrostatic energy
stored in both capacitors before and after the introduction of the dielectric
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2018
Q3
Four point charges Q, q, Q and q are placed at the corners of a square of side ‘a’ as shown in the
figure.
Find the (a) resultant electric force on a charge Q and (b) potential energy of this system.
OR
(a) Three point charges q – 4q and 2q are placed at the vertices of an equilateral triangle ABC of side ‘l’ as shown in the figure. Obtain the expression for the magnitude of the resultant electric force acting on the charge q.
(b) Find out the amount of the work done to separate the charges at infinite distance.
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Find the (a) resultant electric force on a charge Q and (b) potential energy of this system.
OR
(a) Three point charges q – 4q and 2q are placed at the vertices of an equilateral triangle ABC of side ‘l’ as shown in the figure. Obtain the expression for the magnitude of the resultant electric force acting on the charge q.
(b) Find out the amount of the work done to separate the charges at infinite distance.
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2016
Q4
Draw the equipotential surface corresponding to a uniform electric field in the Z direction
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Q5
Derive an expression for the electric potential at any point along the exile line of an electric
dipole.
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Q6
Describe briefly the process of transferring the charge between the 2 plates of a parallel plate
capacitor when connected to a battery derive an expression for the energy stored in a capacitor
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Q7
A parallel plate capacitor is charged by a battery to a potential difference V. It is disconnected
from battery and then connected to another uncharged capacitor of the same capacitance. Calculate
the ratio of the energy stored in the combination to the initial energy on the single capacitor
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2020
Q8
The space between the plates of a parallel plate capacitor is completely filled in two ways. In the
first case, it is filled with a slab of dielectric constant K. In the second case, it is filled with
two slabs of equal thickness and dielectric constants K1 and K2 respectively as shown in the figure.
The capacitance of the capacitor is same in the two cases. Obtain the relationship between K, K1 and
K2 .
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Q9
(a) Find the expression for the potential energy of a system of two point charges q1 and q2 located
at (r1⃗ ) and (r2⃗ ) , respectively in an external electric field (E⃗ )
(b) Draw equipotential surfaces due to an isolated point charge (– q) and depict the electric field lines
(c) Three point charges + 1 μC, – 1 μC and + 2 μC are initially infinite distance apart. Calculate the work done in assembling these charges at the vertices of an equilateral triangle of side 10 cm.
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(b) Draw equipotential surfaces due to an isolated point charge (– q) and depict the electric field lines
(c) Three point charges + 1 μC, – 1 μC and + 2 μC are initially infinite distance apart. Calculate the work done in assembling these charges at the vertices of an equilateral triangle of side 10 cm.
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