Question
Explain "Electron Theory of Electric Charge".
✓
Answer
SELF
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Suppose the space between the two inner shells of the previous problem is filled with a dielectric of dielectric coastant K. Find the capacitance of the system between A and B.
Derive an expression for magnetic field intensity due to a magnetic dipole at a point lies on its equatorial line.
The first four spectral lines in the Lyman serics of a $H-$ atom are $\lambda = 1218 \mathring A , 1028 \mathring A , 974.3 \mathring A$ and $951.4 \mathring A .$ If instead of Hydrogen, we consider Deuterium, calculate the shift in the wavelength of these lines.
→Derive Snell's law for refraction of light by Huygen's wave theory.
Answer the following the questions.
- A small compass needle of magnetic moment ‘m’ is free to turn about an axis perpendicular to the direction of uniform magnetic field ‘B’. The moment of inertia of the needle about the axis is ‘I’. The needle is slightly disturbed from its stable position and then released. Prove that it executes simple harmonic motion. Hence deduce the expression for its time period.
- A compass needle, free to turn in a vertical plane orients itself with its axis vertical at a certain place on the earth. Find out the values of (i) horizontal component of earth’s magnetic field and (ii) angle of dip at the place.
An electric kettle used to prepare tea, takes $2$ minutes to boil $4$ cups of water $(1$ cup contains $200cc$ of water$)$ if the room temperature is $25C.$
→- If the cost of power consumption is $Rs. 1.00$ per unit $(1$ unit $- 1000$ watt$-$hour$),$ calculate the cost of boiling $4$ cups of water.
- What will be the corresponding cost if the room temperature drops to $5^\circ C?$
How many is energy states are present in one mole of sodium vapour? Are they all filled in normal conditions? "How many $3s$ energy states are present in one mole of sodium vapour? Are they all filled in normal conditions?
→A magnetic field $B$ is confined to a region $ r \leq$ a and points out of the paper $($the $z-$ axis$), r = 0$ being the centre of the circular region. $A$ charged ring $ ($charge $= Q)$ of radius $b, b > a$ and mass m lies in the $x-y$ plane with its centre at the origin. The ring is free to rotate and is at rest. The magnetic field is brought to zero in time $\triangle t$. Find the angular velocity $\omega$ of the ring after the field vanishes.
→A charge Q is placed at the centre of an uncharged, hollow metallic sphere of radius a:
- Find the surface charge density on the inner surface and on the outer surface.
- If a charge q is put on the sphere, what would be the surface charge densities on the inner and the outer surfaces?
- Find the electric field inside the sphere at a distance x from the centre in the situations (a) and (b).
The emf $\epsilon$ and the internal resistance r of the battery, shown in the figure. are 4.3V and $1.0\Omega$ respectively. The external resistance R is $50\Omega.$ The resistances of the ammeter and voltmeter are $2.0\Omega$ and $200\Omega$ respectively. (a) Find the readings of the two $200\Omega$ respectively. (a) Find the readings of the two meters. (b) The switch is thrown to the other side. What will be the readings of the two meters now?
→