A narrow electron beam passes undeviated through an electric field E = 3 
and an overlapping magnetic field B = 2 
. If electric field and magnetic field are mutually perpendicular. The speed of the electrons is
|
(a) 60 m/s |
(b) 10.3 |
(c) 1.5 |
(d) 0.67 |
(c) 1.5 
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If a rod has resistance 4 W and if rod is turned as half cycle then the resistance along diameter
|
(a) 1.56 W |
(b) 2.44 W |
(c) 4 W |
(d) 2 W |
The ratio of electric fields on the axis and at equator of an electric dipole will be
|
(a) 1 : 1 |
(b) 2 : 1 |
(c) 4 : 1 |
(d) None of these |
The half-life of 
is 5 days. What time is taken by (7/8)th part of the sample to decay
|
(a) 3.4 days |
(b) 10 days |
(c) 15 days |
(d) 20 days |
A particle of charge q and mass m is moving along the x -axis with a velocity v and enters a region of electric field E and magnetic field B as shown in figure below for which figure the net force on the charge may be zero
|
(a)
|
(b)
|
(c)
|
(d)
|
