NEET Physics Electrostatic Potential And Capacitance MCQs

Two identical capacitors are charged individually to voltages $V_1$ and $V_2$. They are then connected in parallel with plates of like polarity joined together. After the system comes to equilibrium, what is the electrostatic energy stored in the system?

A parallel plate capacitor with capacitance C is charged to a potential V. It is then disconnected from the battery and the distance between the plates is doubled. What happens to the energy stored in the capacitor?

A spherical capacitor with inner radius 'a' and outer radius 'b' is filled with a dielectric of permittivity $\epsilon$. A second spherical capacitor with inner radius 'b' and outer radius 'c' is filled with a dielectric of permittivity $2\epsilon$. If these two capacitors are connected in series, what is the equivalent capacitance of the combination?

A parallel plate capacitor is filled with two dielectrics of permittivities $\epsilon_1$ and $\epsilon_2$, each occupying half the volume as shown. If the area of each plate is A and the plate separation is d, what is the capacitance?

A capacitor of capacitance C is charged to a potential difference V and then connected across an uncharged capacitor of capacitance 2C. When the system reaches equilibrium, what is the total electrostatic energy stored in the system?

Two equal and opposite charges $+q$ and $-q$ are separated by a small distance $2a$. A third charge $+Q$ is placed at a distance $r$ from the midpoint of the dipole along its axial line, where $r >> a$. If the dipole is rotated by $90^\circ$ about its midpoint, the potential energy of the system changes by:

An electric dipole with dipole moment $\mathbf{p} = p_0\mathbf{i}$ is placed at the origin. The electric potential at a point $(r, heta)$ is $V$. If $r >> a$, where $2a$ is the dipole separation, which of the following is correct regarding the equipotential surfaces?

A short electric dipole is placed at the origin with its axis along the x-axis. If the dipole moment is $p$, the locus of points where the electric potential is zero is given by:

An electric dipole of moment $\vec{p}$ is placed in a uniform electric field $\vec{E}$. The dipole is rotated by a small angle $heta$ from its equilibrium position. The restoring torque acting on the dipole is proportional to:

A very small electric dipole is placed at origin with its dipole moment directed along positive x-axis. A semicircular arc of radius R is drawn in the y-z plane with its centre at the origin. The potential at any arbitrary point on this arc is: