MCQ
Electrons moving with different speeds enter a uniform magnetic field in a direction perpendicular to the field., time periods of rotation will be :
  • same for all electrons
  • B
    greater for the faster electrons
  • C
    smaller for the faster electrons
  • D
    either $(b)$ or $(c)$ depending on the magnitude of the magnetic field

Answer

Correct option: A.
same for all electrons
a
$T=\frac{2 \pi m}{q B}$

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

$Assertion :$ The ratio of $\frac{C_p}{C_v}$ for an ideal diatomic gas is less than that for an ideal monoatomic gas (where $C_p$ and $C_v$ have usual meaning).
$Reason :$ The atoms of a monoatomic gas have less degrees of freedom as compared to molecules of the diatomic gas.
Figure shows a polytropic process for an ideal gas. The work done by the gas will be in process $AB$ is
A screwgauage has pitch $1.5\;  mm$ and there is no zero error. Linear scale has marking at $MSD = 1\; mm$  and there are $100$ equal division of circular scale. When diameter of a sphere is measured with instrument, main scale is having $2\; mm$ mark visible on linear scale, but $3\; mm$ mark is not visible, $76^{th}$ division of circuler scale is in line with linear scale. .......... $mm$ is the diameter of sphere.
Particle $A$ of mass $m _{1}$ moving with velocity $(\sqrt{3} \hat{i}+\hat{j})\, ms ^{-1}$ collides with another particle $B$ of mass $m _{2}$ which is at rest initially. Let $\overrightarrow{ V }_{1}$ and $\overrightarrow{ V }_{2}$ be the velocities of particles $A$ and $B$ after collision respectively. If $m _{1}=2\, m _{2}$ and after collision $\overrightarrow{ V }_{1}=(\hat{ i }+\sqrt{3} \hat{ j })\, ms ^{-1},$ the angle between $\overrightarrow{ V }_{1}$ and $\overrightarrow{ V }_{2}$ is$......^o$
If the gravitational acceleration at surface of Earth is $g,$  then increase in potential energy in lifting an object of mass $m$  to a height equal to half of radius of earth from surface will be
The ratio of mean kinetic energy of hydrogen and oxygen at a given temperature is
In the circuit shown below, if the potential at point $A$ is taken to be zero, the potential at point $B$ is .............. $V$
Two forces of $12 \,N$ and $8 \,N$ act upon a body. The resultant force on the body has maximum value of........$N$
A light wave is incident normally over a slit of width $24 \times {10^{ - 5}}cm$. The angular position of second dark fringe from the central maxima is $30^{o}$. What is the wavelength of light............$\mathop A\limits^o $
A man crosses a $320\, m$ wide river perpendicular to the current in $4$ minutes. If in still water he can swim with a speed $5/3$ times that of the current, then the speed of the current, in $m/min$ is