MCQ
A thin metal plate $P$ is inserted half way between the plates of a parallel plate capacitor of capacitance $C$ in such a way that it is parallel to the two plates. The capacitance now becomes
  • $C$
  • B
    $C/2$
  • C
    $4C$
  • D
    None of these

Answer

Correct option: A.
$C$
a
(a) Thin metal plates doesn't affect the capacitance.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Which of the following is not the unit of self inductance
In Young's double slit experiment, the two slits act as coherent sources of equal amplitudeAand wavelength $\lambda$ . In another experiment with the same setup the two slits are sources of equal amplitudeAand wavelength $\lambda$ but are incoherent. The ratio of the intensity of light at the midpoint of the screen in the first case to that in the second case is
If polarising angle of a piece of glass for green light is $54.74^o$ , then the angle of minimum deviation for an equilateral prism made of same glass is......$^o$

(Given $tan\,54.74^o = 1 .414$)

For plan electromagnetic waves propagating in the $z-$ direction, which one of the following combination gives the correct possible direction for $\vec E$ and $\vec B$ field respectively?
Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length + 20 cm when in air and its material has refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is
An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment distances are measured by:
Certain radioactive substance reduces to $25\%$ of its value in $16\ days$. Its half-life is .......... $days$
Three prisms of crown glass, each have angle of prism $9^o $ and two prisms of flint glass are used to make direct vision spectroscope. What .......$^o$ will be the angle of flint glass prisms if $\mu $ for flint is $1.60$ and $\mu $ for crown glass is $1.53$
In $R - L - C$ series circuit, the potential differences across each element is $20V$. Now the value of the resistance alone is doubled, then $P.D$. across $R, L$ and $C$ respectively.
After $3$ hours, only $0.25 \,mg$ of a pure radioactive material is left. If initial mass was $2 \,mg$ then the half life of the substance is ...... $hr$