An electron having charge  and mass  is moving with  speed in a magnetic field  in a circular orbit. The force acting on electron and the radius of the circular orbit is ____.
An electron enters a magnetic field whose direction is perpendicular to the velocity of the electron. Then ____.
The speed of the electron will increase
The speed of the electron will decrease
The speed of the electron will remain the same
The velocity of the electron will remain the same
An electron is moving in the north direction. It experiences a force in vertically upward direction. The magnetic field at the position of the electron is in the direction of ____.
A current carrying long solenoid is placed on the ground with its axis vertical. A proton is falling along the axis of the solenoid with a velocity v. When the proton enters into the solenoid, it will ____.
Be deflected from its path
Be accelerated along the same path
Be decelerated along the same path
Move along the same path with no change in velocity
An electron is accelerated by a potential difference of 12000 volts. It then enters a uniform magnetic field of  applied perpendicular to the path of electron. Find the radius of path. Given mass of electron  and charge on electron  ____.
36.7 m
36.7 cm
3.67 m
3.67 cm
The charge on a particle Y is double the charge on particle X. These two particles X and Y after being accelerated through the same potential difference enter a region of uniform magnetic field and describe circular paths of radii  and  respectively. The ratio of the mass of X to that of Y is ____.
A particle with  of charge and  mass is moving with a velocity of  along the y-axis. A uniform static magnetic field  is acting along the x-direction. The force on the particle is ____.
A charged particle enters a magnetic field H with its initial velocity making an angle of  with H. The path of the particle is ____.
A straight line
A circle
An ellipse
A helix
An electron and a proton enter a magnetic field perpendicularly. Both have same kinetic energy. Which of the following is true?
Trajectory of electron is less curved
Trajectory of proton is less curved
Both trajectories are equally curved
Both move on straight-line path
A charged particle moves in a uniform magnetic field. The velocity of the particle at some instant makes an acute angle with the magnetic field. The path of the particle is ____.
A straight line
A circle
A helix with uniform pitch
A helix with non-uniform pitch


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