(a) Obtain the conditions under which an electron does not suffer any deflection while passing through a magnetic field.
(b) Two protons P and Q moving with the same speed pass through the magnetic fields and respectively, at right angles to the field directions. If , which of the two protons will describe the circular path of smaller radius? Explain.
(a) An electron does not suffer any deflection while passing through a magnetic field when it is parallel or anti-parallel to the magnetic field.
(b) The radius of the circular path
Or,
[ m,v and q are constant or same ]
Thus as,
Hence,