Which of the following molecules is nonpolar?
- A$N _2 O$
- B$H _2 O$
- C$HCl$
- ✓$CO _2$
Answer: D.
View full solution →Question types
Electrostatics question types
220 questions across 4 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
220
Questions
4
Question groups
5
Question types
01
M.C.Q (1 Marks)
69 Q→02Short Answer Type Question
27 Q→03Answer the following in Brief
46 Q→04Answer the following in Detail
78 Q→Sample Questions
Electrostatics questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
The potential energy of a dipole iii a uniform electric held $\vec{E}$ is minimum when the dipole moment is
- Atransverse to $\vec{E}$
- ✓parallel to $\vec{E}$
- Cantiparallel to $\vec{E}$
- Deither parallel or antiparallel to $\vec{E}$.
Answer: B.
View full solution →The figure shows three capacitors $C_1 C_2$ and $C_3$. The dashed lines are equipotential surfaces within each capacitor. In which of the capacitors is the po. between the two equipotentials $\Delta V =50 V$ ?
- AOnly in $C_1$
- BOnly in $C _1$ and $C _2$
- COnly in $C _3$
- ✓In all three capacitors
Answer: D.
View full solution →In the diagram, $\vec{E}$ is a uniform electric field. Point $B$ is to the west of point $A$ while point $C$ is to the east and point $D$ is to the south. Which of the following is correct?
- A$V_B>V_A>V_C$
- B$V_B<V_A<V_C$
- ✓$V_B=V_C$
- D$V_D=V_A$
Answer: C.
View full solution →The intensity of electric field at a point clone but outside a charged conducting cylinder is proportional to
[r is the distance of the point from the axis of the cylinder]
- ✓$\frac{1}{r}$
- B$\frac{1}{r^2}$
- C$\frac{1}{r^3}$
- D$r$.
Answer: A.
View full solution →The electric field intensity at a point on the surface of a long. charged cylinder in air is $100 V / m$. Find the surface charge density on the cylinder.
View full solution →What is the Van de Graaff generator?
The electrostatic energy of $3.5 \times 10^{-4} J$ is stored in a capacitor at $700 V$. What is the charge on the capacitor?
View full solution →The capacitance of a charged capacitor is $C$ and the energy stored in it is $U$. What is the value of the charge on the capacitor?
View full solution →If the charge on a capacitor is $2 \mu C$ and the potential difference across the conductors forming the capacitor is $100 V$, what is the electrostatic energy stored in the capacitor?
View full solution →Is electrostatic potential necessarily zero at a point where electric field strength is zero? Justify.
If we apply a large enough electric field, we can ionize the atoms and create a condition for electric charge to flow like a conductor. The fields required for the breakdown of dielectric is called dielectric strength.
What is gravitational Potential ?
A spherical shell of radius b with charge Q is expanded to a radius a. Find the work done by the electrical forces in the process.
The safest way to protect yourself from lightening is to be inside a car. Justify.
(1) If there are n parallel plates then there will be $(n-1)$ capacitors, hence
$
C=(n-1) \frac{A \varepsilon_0}{d}
$
(2) For a spherical capacitor, consisting of two concentric spherical conducting shells with inner and outer radii as $a$ and $b$ respectively, the capacitance $C$ is given by $C=4 \pi \varepsilon_0\left(\frac{a b}{b-a}\right)$
(3) For a cylindrical capacitor, consisting of two coaxial cylindrical shells with radii of the inner and outer cylinders as $a$ and $b$, and length $I$, the capacitance $C$ is given by
$
C=\frac{2 \pi \varepsilon_0 \ell}{\log _e \frac{b}{a}}
$
View full solution →$
C=(n-1) \frac{A \varepsilon_0}{d}
$
(2) For a spherical capacitor, consisting of two concentric spherical conducting shells with inner and outer radii as $a$ and $b$ respectively, the capacitance $C$ is given by $C=4 \pi \varepsilon_0\left(\frac{a b}{b-a}\right)$
(3) For a cylindrical capacitor, consisting of two coaxial cylindrical shells with radii of the inner and outer cylinders as $a$ and $b$, and length $I$, the capacitance $C$ is given by
$
C=\frac{2 \pi \varepsilon_0 \ell}{\log _e \frac{b}{a}}
$
Series combination is used when a high voltage is to be divided on several capacitors. Capacitor with minimum capacitance has the maximum potential difference between the plates.
Due to a single charge at a distance r, Force $(F ) α 1/r^2$, Electric field $(E ) \alpha 1/r^2$ but Potential $(V) α 1/ r$.
View full solution →Find the equivalent capacitance between P and Q. Given, area of each plate = A and separation between plates = d.
In a parallel plate capacitor with air between the plates, each plate has an area of $6 \times 10^{-3}\ m^2$ and the separation between the plates is $2 mm$.
i) Calculate the capacitance of the capacitor.
ii) If this capacitor is connected to $100\ V$ supply, what would be the charge on each plate?
iii) How would charge on the plates be affected if a $2$ mm thick mica sheet of $k = 6$ is inserted between the plates while the voltage supply remains connected ?
View full solution →i) Calculate the capacitance of the capacitor.
ii) If this capacitor is connected to $100\ V$ supply, what would be the charge on each plate?
iii) How would charge on the plates be affected if a $2$ mm thick mica sheet of $k = 6$ is inserted between the plates while the voltage supply remains connected ?
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