If cathode rays are projected at right angles to a magnetic field, their trajectory is
|
(a) Ellipse |
(b) Circle |
(c) Parabola |
(d) None of these |
(b) Circle
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A proton, a deuteron and an α - particle having the same kinetic energy are moving in circular trajectories in a constant magnetic field. If 
and 
denote respectively the radii of the trajectories of these particles, then
|
(a) |
(b) |
(c) |
(d) |
A long magnetic needle of length 2L, magnetic moment M and pole strength m units is broken into two pieces at the middle. The magnetic moment and pole strength of each piece will be
|
(a) |
(b) M, |
(c) |
(d) M, m |
A metal rod moves at a constant velocity in a direction perpendicular to its length. A constant uniform magnetic field exists in space in a direction perpendicular to the rod as well as its velocity. Select the correct statement(s) from the following
|
(a) The entire rod is at the same electric potential |
|
(b) There is an electric field in the rod |
|
(c) The electric potential is highest at the centre of the rod and decreases towards its ends |
|
(d) The electric potential is lowest at the centre of the rod and increases towards its ends |
If three bulbs 60W, 100W and 200W are connected in parallel, then
|
(a) 200 W bulb will glow more |
(b) 60 W bulb will glow more |
|
(c) 100 W bulb will glow more |
(d) All the bulbs will glow equally |
In electrolysis, if the duration of the passage of current is doubled, the mass liberated i
|
(a) Doubled |
(b) Halved |
(c) Increased four times |
(d) Remains the same |
