MCQ
One metallic sphere $A$ is given positive charge whereas another identical metallic sphere $B$ of exactly same mass as of $A$ is given equal amount of negative charge. Then
  • A
    Mass of $A$ and mass of $B$ still remain equal
  • B
    Mass of $A$ increases
  • C
    Mass of $B$ decreases
  • Mass of $B$ increases

Answer

Correct option: D.
Mass of $B$ increases
d
(d) Negative charge means excess of electron which increases the mass of sphere $B$.

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 person of mass $M$ is, sitting on a swing of length $L$ and swinging with an angular amplitude $\theta_0$. If the person stands up when the swing passes through its lowest point, the work done by him, assuming that his centre of mass moves by a distance $l\, ( l < < L)$, is close to
Eight dipoles of charges of magnitude $e$ are placed inside a cube. The total electric flux coming out of the cube will be
In a $PNP$ transistor working as a common-base amplifier, current gain is $0.96$ and emitter current is $7.2\, mA$. The base current is.....$mA$
A solid uncharged conducting sphere has radius $3a$ contains a hollowed spherical region of radius $2a$. A point charge $+Q$ is placed at a position a distance a from the common center of the spheres. What is the magnitude of the electric field at the position $r = 4a$ from the center of the spheres as marked in the figure by $P?$ $\left( {k = \frac{1}{{4\pi { \in _0}}}} \right)$
In the $ n^{th} $ orbit, the energy of an electron ${E_n} = - \frac{{13.6}}{{{n^2}}}eV$ for hydrogen atom. The energy required to take the electron from first orbit to second orbit will be.....$eV$
An object is projected horizontally with speed $\frac{1}{2} \sqrt{\frac{G M}{R}}$, from a point at height $3 R$ [where $R$ is radius and $M$ is mass of earth, then object will] 
Black hole is a
Two particles of equal mass go round a circle of radius $R$ under the action of their mutual gravitational attraction. The speed of each particle is
A point mass '$m$" is moved in a vertical circle of radius 'r" with the help of a string. The velocity of the mass is $\sqrt{7 gr }$ at the lowest point. The tension in the string at the lowest point is .......... $mg$
An electron with kinetic energy $E$ collides with a hydrogen atom in the ground state. The collision will be elastic