MAGNETIC EFFECTS OF CURRENT(TEST -4)

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 ____.
East
West
North
South
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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MAGNETIC EFFECTS OF CURRENT

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