Moving Charges ...

A neutron, a proton, an electron and an $$\alpha$$ particle enters a uniform magnetic field with equal velocities. The field is directed along the inward normal to the plane of the paper. Which of these tracks followed are by electron and $$\alpha$$ particle ?

An alpha particle and proton have same velocity when enter uniform magnetic field. The period of rotation of proton will be 

A charged particle moves through a magnetic field perpendicular to its direction, then

If the radius of the circle is 0.5 m and the magnitude of the magnetic field is $$1.2 W bm^{-2}$$, find the frequency and the kinetic energy of the proton. Charge of the proton =$$ 1.60\times 10^{-19}C.$$ Mass of the proton = $$1.67\times 10^{-27}kg$$.

An electron moves straight inside a charged parallel plate capacitor of uniform surface charged density $$\sigma$$. The length of capacitor plates is $$l$$. The space between the plates is filled with constant magnetic field of induction $$\overrightarrow {B} $$. The time of straight line motion of the electron in the capacitor is:

A charged particle $$q$$ enters a region of uniform magnetic field (out of the page) end is deflected a distance $$d$$ after travelling a horizontal distance $$a$$. The magnitude of the momentum of the particle is:

Consider a region where both uniform electric and magnetic fields E and B are present both along the z-axis. A positively charged particle of charge and mass is released from the origin with an initial velocity $${{\text{V}}_e}\hat i$$. Which of the following option(s) are correct?

H$$^ +  $$, He$$^ +  $$ and O$$^ +  $$$$^ +  $$ all having the same kinetic energy pass through a region in which there is a uniform magnetic field perpendicular to their velocity. the masses of H$$^ +  $$, He$$^ +  $$ and O$$^ +  $$$$^ +  $$   are 1 a.m.u., 4 a.m.u. and 16 a.m.u. respectively. Then

Two particle, A and B having equal mass from being accelerated through the same potential difference enter a region of uniform magnetic field and particle describe a circular path of radii $$R_1$$ and $$R_2$$ respectively. The ratio of the charge on A and B is:

An $$\alpha  $$ - particle crosses a space without any deflection. If electric field E = 8 x $$10^{6} $$ V/m and magnetic field is B = 1.6 T, the velocity of particle is