Questions in Moving Charges and Magnetism

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A proton and an alpha particle are separately projected in a region where a uniform magnetic field exists. Their initial velocities are perpendicular to direction of magnetic field. If both the particles move around magnetic field in circles of equal radii, the ratio of momentum of proton to alpha particle $\left( {\frac{{{P_p}}}{{{P_\alpha }}}} \right)$is
A particle of mass 0.6 g and having charge of 25 nC is moving horizontally with a uniform velocity ${\rm{1}}{\rm{.2}} \times {\rm{1}}{{\rm{0}}^{\rm{4}}}m{s^{ - 1}}$ in a uniform magnetic field, then the value of the magnetic induction is $(g = 10\,m{s^{ - 2}})$
An $\alpha $ particle and a proton travel with same velocity in a magnetic field perpendicular to the direction of their velocities, find the ratio of the radii of their circular path
Motion of a moving electron is not affected by
When a charged particle enters a uniform magnetic field its kinetic energy
If cathode rays are projected at right angles to a magnetic field, their trajectory is
At a specific instant emission of radioactive compound is deflected in a magnetic field. The compound can emit (i) Electrons (ii) Protons (iii) $H{e^{2 + }}$ (iv) NeutronsThe emission at the instant can be
Which particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field
Mixed $H{e^+}$and ${O^{2 + }}$ ions (mass of $H{e^ + } = 4\,\,amu$ and that of ${O^{2 + }} = 16\,\,amu)$ beam passes a region of constant perpendicular magnetic field. If kinetic energy of all the ions is same then
An electron (mass = $9 \times 10^{–31}$ kg. Charge = $1.6 \times 10^{–19}$ C) whose kinetic energy is $7.2 \times 10^{–18}$ joule is moving in a circular orbit in a magnetic field of $9 \times 10^{–5} weber/m^2$. The radius of the orbit is

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