MAGNETIC EFFECTS OF CURRENT online Test

If an electron enters a magnetic field with its velocity pointing in the same direction as the magnetic field, then ____.
The electron will turn to its right
The electron will turn to its left
The velocity of the electron will increase
The velocity of the electron will remain unchanged
An electron moving towards the east enters a magnetic field directed towards the north. The force on the electron is directed ____.
Vertically upward
Vertically downward
Towards the west
Towards the south
An electron (charge q coulomb) enters a magnetic field of H
with a velocity of
in the same direction as that of the field the force on the electron is ____.
Hqv Newton’s in the direction of the magnetic field
Hqv dynes in the direction of the magnetic field
Hqv Newton’s at right angles to the direction of the magnetic field
Zero
A homogeneous electric field E and a uniform magnetic field
are pointing in the same direction. A proton is projected with its velocity parallel to
. It wills ____.
Go on moving in the same direction with increasing velocity
Go on moving in the same direction with constant velocity
Turn to its right
Turn to its left
Cyclotron is used to accelerate ____.
Electrons
Neutrons
Positive ions
Negative ions
Two particles A and B of masses
and
respectively and having the same charge are moving in a plane. A uniform magnetic field exist perpendicular to this plane. The speeds of the particles are
and
respectively, and the trajectories are as shown in the figure. Then ____.

A particle of mass 0.6 g and having charge of 25 nC is moving horizontally with a uniform velocity
in a uniform magnetic field, and then the value of the magnetic induction is
____.
Zero
10 T
20 T
200 T
Motion of a moving electron is not affected by ____.
An electric field applied in the direction of motion
Magnetic field applied in the direction of motion
Electric field applied perpendicular to the direction of motion
Magnetic field applied perpendicular to the direction of motion
When a charged particle enters a uniform magnetic field its kinetic energy ____.
Remains constant
Increases
Decreases
Becomes zero
If cathode rays are projected at right angles to a magnetic field, their trajectory is ____.
Ellipse
Circle
Parabola
None of the above