MCQ
One conducting sphere has 50e charge and the other identical sphere has + 20e charge. If both the sphere are touched and separated, then the charge on each will be:
  • -15e
  • B
    + 15e
  • C
    10e
  • D
    25e

Answer

Correct option: A.
-15e
(a)-15e

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 series $LCR$ circuit driven by $300\, {V}$ at a frequency of $50 \,{Hz}$ contains a resistance ${R}=3 \,{k} \Omega$, an inductor of inductive reactance $X_{L}=250 \,\pi \Omega$ and an unknown capacitor. The value of capacitance to maximize the average power should be : (Take $\pi^{2}=10$ ) (in $\mu {F}$)
In a lossless transformer an alternating current of $2\, amp$ is flowing in the primary coil. The number of turns in the primary and secondary coils are $100$ and $20$ respectively. The value of the current in the secondary coil is.......$A$
The linear portions of the characteristic curves of a triode valve give the following readings The plate resistance is.......$ohms$

${{V}_{g}}$(volt)

$0$

$- 2$

$- 4$

$- 6$

${{I}_{p}}(mA)$ for ${{V}_{p}}=150volts$

$ 15$

$12.5$

$10$

$7.5$

${{I}_{p}}(mA)$ for ${{V}_{p}}=120volts$

$10$

$7.5$

$5$

$2.5$

Three long, straight and parallel wires carrying currents are arranged as shown in figure. The force experienced by $10\, cm$ length of wire $Q$ is
Two very thin metallic wires placed along X and Y-axis carry equal currents as shown here. AB and CD are lines at 45° with the axes with origin of axes at O. The magnetic field will be zero on the line
A disk of radius $a / 4$ having a uniformly distributed charge $6 C$ is placed in the $x-y$ plane with its centre at $(-a / 2,0,0)$. A rod of length $a$ carrying a uniformly distributed charge $8 C$ is placed on the $x$-axis from $x=a / 4$ to $x=5 a / 4$. Two point charges $-7 C$ and $3 C$ are placed at $(a / 4,-$ $a / 4,0)$ and $(-3 a / 4,3 a / 4,0)$, respectively. Consider a cubical surface formed by six surfaces $x=\pm a / 2, y=\pm a / 2, z=\pm a / 2$. The electric flux through this cubical surface is
Choose the correct answer from the alternatives given.
Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor.
Figure shows a cross-section of a large-section of an infinite metal sheet carrying an electric current along its surface. The current per unit length is $J$ . A current carrying square loop is placed nearby the metal sheet such that the plane of square is perpendicular to the plane of sheet then 
The direct current which would give the same heating effect in an equal constant resistance as the current shown in figure, i.e. the $r.m.s.$ current, is.....$A$
In an ac circuit, the instantaneous current is zero, when the instantaneous voltage is maximum. In this case, the source may be connected to:

$A$. pure inductor.

$B$. pure capacitor.

$C$. pure resistor.

$D$. combination of an inductor and capacitor.

Choose the correct answer from the options given below: