Download App

Electric Charges and Fields — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectric Charges and Fields2 Marks
Question
A hydrogen atom contains one proton and one electron. It may be assumed that the electron revolves in a circle of radius 0.53 angstrom (1 angstrom = 10-10m and is abbreviated as A) with the proton at the centre. The hydrogen atom is said to be in the ground state in this case. Find the magnitude of the electric force between the proton and the electron of a hydrogen atom in its ground state.
✓

Answer

$\text{R}=0.53\text{A}^\circ=0.53\times10^{-10}\text{m}$

$\text{F}=\frac{\text{Kq}_1\text{q}_2}{\text{r}^2}$

$=\frac{9\times10^9\times1.6\times1.6\times10^{-38}}{0.53\times0.53\times10^{-10}\times10^{-10}}$

$=82.02\times10^{-9}\text{N}$

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 "2 Marks Questions" from Electric Charges and Fields→Electric Charges and Fields — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

The drift current in a p-n junction is $20.0\mu\text{A}.$ Estimate the number of electrons crossing a cross-section per second in the depletion region.
→
What was the difficulty with the wave theory ? How was this difficulty explained using Maxwell's Electro-magnetic wave theory ?
→
State Kirchhoff's rules. Explain briefly how these rules are justified.
→
What is called polar and non-polar atom ? Give example of it.
→
A wire of 15 $\Omega$ resistance is gradually stretched to double its original length. It is then cut into two equal parts. These parts are then connected in parallel across a 3.0 volt battery. Find the current drawn from the battery.
→
What is called equipotential surface? Draw equipotential surfaces for point charges and write their properties.
→
A ball is projected from a point on the floor with a speed of 15m/s at an angle of 60° with the horizontal. Will it hit a vertical wall 5m away from the point of projection and perpendicular to the plane of projection without hitting the floor? Will the answer differ if the wall is 22m away?
→
When does a charge be source of origin of electromagnetic waves? How are the magnetic field and electric field mutually and with the transmission of wave related? Which physical quantity is same for waves of all parts of electromagnetic classification?
→
Assume that the magnetic field is uniform in a cubical region and is zero outside. Can you project a charged particle from outside into the field so that the particle describes a complete circle in the field?
→
A steel wire and a copper wire of equal length and equal cross-sectional area are joined end to end and the combination is subjected to a tension. Find the ratio of.
  1. The stresses developed in the two wires.
  2. The strains developed. Y of steel = 2 × 1011N/m2. Y of copper =  1.3 × 1011N/m2.
→