Download App

2. Electric potential and capacitance — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics2. Electric potential and capacitance1 Mark
MCQ
An electron enters between two horizontal plates separated by $2\,mm$ and having a potential difference of $1000\,V$. The force on electron is
  • A
    $8 \times {10^{ - 12}}\,\, N$
  • ✓
    $8 \times {10^{ - 14}}\,\, N$
  • C
    $8 \times {10^9}\,\, N$
  • D
    $8 \times {10^{14}}$ $N$
✓

Answer

Correct option: B.
$8 \times {10^{ - 14}}\,\, N$
b
(b) Force on electron $F = QE$ $ = Q\,\left( {\frac{V}{d}} \right)$
$⇒$ $F = (1.6 \times {10^{ - 19}})\,\left( {\frac{{1000}}{{2 \times {{10}^{ - 3}}}}} \right) = 8 \times {10^{ - 14}}\,N$

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

Explore more

More "M.C.Q (1 Marks)" from 2. Electric potential and capacitance→2. Electric potential and capacitance — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Two coherent monochromatic light beams of intensities $I$ and $4I$ are superimposed. The difference between maximum and minimum possible intensities in the resulting beam is $\mathrm{x}$ I. The value of $x$ is . . . . 
→
Consider a system of three charges $\frac{q}{3},\frac{q}{3}$ and $\frac{-2q}{3}$ placed at points $A,B$ and $C$, respectively, as shown in the figure. Take $O$ to be the centre of the circle of radius $R$ and angle $CAB = 60^o$
→
Magnetic field can be defined as the:
→
Temperature coefficient at $0\,^oC$ is $0.00125\,^oC^{-1}$. At a temperature of $25\,^oC$ its resistance is $1\,\Omega $. Find the temperature at which resistance is $1.2\,\Omega $
→
In the balanced condition, the values of the resistances of the four arms of a Wheatstone bridge are shown in the figure below. The resistance $R_3$ has temperature coefficient $0.0004{ }^{\circ} C ^{-1}$. If the temperature of $R_3$ is increased by $100{ }^{\circ} C$, the voltage developed between $S$ and $T$ will be. . . . . . . volt.
→
$12$ signals each band limited to $5\, kHz$ are to be transmitted by frequency-division multiplexer. If $AM-SSB$ modulation guard band of $1\, kHz$ is used then the bandwidth of multiplexed signal is.......$ kHz$
→
The diagram shows a silvered equiconvex lens. An object of length $1\,cm$ has been placed in the front of the lens. What will be the final image properties? The refractive index of the lens is $\mu$ and the refractive index of the medium in which the lens has been placed is $2\mu$ . Both the surface have the radius $R.$
→
In the network of resistors shown in the adjoining figure, the equivalent resistance between $A$ and $B$ is ............ $ohm$
→
A potentiometer has uniform potential gradient across it. Two cells connected in series
(i) to support each other and
(ii) to oppose each other are balanced over 6m and 2m respectively on the potentiometer wire.
The e.m.f.’s of the cells are in the ratio of
→
The equivalent resistance of the infinite network given below is :
→