A positive charge $'q'$ of mass $'m'$ is moving along the $+ x$ axis. We wish to apply a uniform magnetic field $B$ for time $\Delta t$ so that the charge reverses its direction crossing the $y$ axis at a distance $d.$ Then
A positive charge $'q'$ of mass $'m'$ is moving along the $+ x$ axis. We wish to apply a uniform magnetic field $B$ for time $\Delta t$ so that the charge reverses its direction crossing the $y$ axis at a distance $d.$ Then
- [JEE MAIN 2014]
- A
$B\, = \,\frac{{mv}}{{qd}}$ and $\Delta t\, = \,\frac{{\pi d}}{v}$
- B
$B\, = \,\frac{{mv}}{{2qd}}$ and $\Delta t\, = \,\frac{{\pi d}}{2v}$
- C
$B\, = \,\frac{{2mv}}{{qd}}$ and $\Delta t\, = \,\frac{{\pi d}}{2v}$
- D
$B\, = \,\frac{{2mv}}{{qd}}$ and $\Delta t\, = \,\frac{{\pi d}}{v}$
Similar Questions
What is source of magnetic field ?
What is source of magnetic field ?
A stream of charged particles enter into a region with crossed electric and magnetic fields as shown in the figure below. On the other side is a screen with a hole that is right on the original path of the particles. Then,
A stream of charged particles enter into a region with crossed electric and magnetic fields as shown in the figure below. On the other side is a screen with a hole that is right on the original path of the particles. Then,
- [KVPY 2009]
A uniform electric field and a uniform magnetic field are produced, pointed in the same direction. An electron is projected with its velocity pointing in the same direction
A uniform electric field and a uniform magnetic field are produced, pointed in the same direction. An electron is projected with its velocity pointing in the same direction
- [AIEEE 2005]
Electrons moving with different speeds enter a uniform magnetic field in a direction perpendicular to the field., time periods of rotation will be :
Electrons moving with different speeds enter a uniform magnetic field in a direction perpendicular to the field., time periods of rotation will be :
Mark the correct statement
Mark the correct statement