MCQ
A metallic ring is uniformly charged as shown in figure. $AC$ and $BD$ are two mutually perpendicular diameters. Electric field due to arc $A B$ to '$O$' is '$E$' is magnitude. What would be the magnitude of electric field at '$O$' due to arc $ABC$ ?
Image
  • A
    $2 E$
  • $\sqrt{2} E$
  • C
    $E / 2$
  • D
    Zero

Answer

Correct option: B.
$\sqrt{2} E$
(B) $\sqrt{2} E$
Image

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

A solid cylinder $30\ cm$ in diameter at the top of an inclined plane $2.0\ m$  high is released and rolls down the incline without loss of energy due to friction. Its linear speed at the bottom is.......... $m/\sec$.
A river is flowing from west to east direction with speed of $9 km h ^{-1}$. If a boat capable of moving at a maximum speed of $27 km h ^{-1}$ in still water, crosses the river in half a minute, while moving with maximum speed at an angle of $150^{\circ}$ to direction of river flow, then the width of the river is :
The equation of state of a real gas is given by $\left(\mathrm{P}+\frac{\mathrm{a}}{\mathrm{V}^2}\right)(\mathrm{V}-\mathrm{b})=\mathrm{RT}$, where $\mathrm{P}, \mathrm{V}$ and $\mathrm{T}$ are pressure. volume and temperature respectively and $R$ is the universal gas constant. The dimensions of $\frac{a}{b^2}$ is similar to that of :
A polyatomic gas with $n$ degrees of freedom has a mean energy per molecule given by

($N$ is Avogadro's number)

Four smooth steel balls of equal mass at rest are free to move along a straight line without friction. The first ball is given a velocity of $0.4 \,m/s$. It collides head on with the second elastically, the second one similarly with the third and so on. The velocity of the last ball is .......... $m/s$
Two identical short bar magnets are placed at $120^{\circ}$ as shown in the figure. The magnetic moment of each magnet is $M$. Then the magnetic field at the point $P$ on the angle bisector is given by
A gravitational field is present in a region and a mass is shifted from $A$ to $B$ through different paths as shown. If $W _1, W _2$ and $W _3$ represent the work done by the gravitational force along the respective paths, then
A ball strikes against the floor and returns with double the velocity; in which type of collision is it possible?
A transformer is used to
A tuning fork of frequency $100$ when sounded together with another tuning fork of unknown frequency produces $2$ beats per second. On loading the tuning fork whose frequency is not known and sounded together with a tuning fork of frequency $100$ produces one beat, then the frequency of the other tuning fork is