Download App

Electrostatics — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectrostatics1 Mark
MCQ
An oil drop having charge 2e is kept stationary between two parallel horizontal plates 2.0 cm apart when a potential difference of 12000 volts is applied between them. If the density of oil is 900 kg/m$^3$, the radius of the drop will be
  • A
    $2.0 \times 10^{-6}$m
  • ✓
    $1.7 \times 10^{-6}$m
  • C
    $1.4 \times 10^{-6}$m
  • D
    $1.1 \times 10^{-6}$m
✓

Answer

Correct option: B.
$1.7 \times 10^{-6}$m
(b) $1.7 \times 10^{-6}$m

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 Electrostatics→Electrostatics — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Points $A$ and $B$  are situated along the extended axis of $2\, cm$  long bar magnet at a distance $x $ and $2x$ $ cm$  respectively. From the pole nearer to the points, the ratio of the magnetic field at $ A$ and $B$ will be
→
A galvanometer having a coil resistance of $60\,\,\Omega$ shows full scale deflection when a current of $1.0$ $amp$ passes through it. It can be converted into an ammeter to read currents upto $5.0$ $amp$ by
→
$PQ$ and $RS$ are long parallel conductors separated by certain distance. $M$ is the mid-point between them (see the figure). The net magnetic field at $M$ is $B$ . Now, the current $2\,A$ is switched off. The field at $M$ now becomes
→
The horizontal component of the earth's magnetic field is $0.22$ $Gauss$ and total magnetic field is $0.4$ $Gauss$. The angle of dip. is
→
Crystal structure of NaCl is
→
If $E$ is the electric field intensity of an electrostatic field, then the electrostatic energy density is proportional to
→
For what value of $R$ the net resistance of the circuit will be $18\, ohms$ ............... $\Omega$
→
An observer on earth observes that wave length of spectral line in spectrum of a milky way shifts towards red end of spectrum. According to the observer, the milky-way is:
→
The equivalent capacitance in the circuit between $A$ and $B$ will be.....$\mu \,F$
→
A proton and an $\alpha$-particle are accelerated from rest by $2\,V$ and $4\,V$ potentials, respectively. The ratio of their de-Broglie wavelength is:
→