Two particles $x$ and $y$ have equal charges and possessing equal kinetic energy enter in a uniform magnetic field and describe circular path of radius of curvature $r_1$ and $r_2$ respectively. The ratio of their masses is
$\left( {\frac{{{r_1}}}{{{r_2}}}} \right)$
${\left( {\frac{{{r_1}}}{{{r_2}}}} \right)^{1/2}}$
${\left( {\frac{{{r_1}}}{{{r_2}}}} \right)^2}$
${\left( {\frac{{{r_2}}}{{{r_1}}}} \right)}$
Give expression for the force on a current carrying conductor in a magnetic field.
Explain : Velocity selector.
An electron enters a chamber in which an uniform magnetic field is present as shown in figure. Ignore gravity. During its motion inside the chamber
Electrons moving with different speeds enter a uniform magnetic field in a direction perpendicular to the field., time periods of rotation will be :
Two identical charged particles enter a uniform magnetic field with same speed but at angles $30^o$ and $60^o$ with field. Let $a, b$ and $c$ be the ratio of their time periods, radii and pitches of the helical paths than