Two thin wire rings each having a radius R are placed at a distance d apart with their axes coinciding. The charges on the two rings are +q and -q. The potential difference between the centres of the two rings is
|
(a) Zero |
(b) |
|
(c) |
(d) |
(d) 
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$\frac{\text{v}}{4}$
$\frac{\text{v}}{2}$
$\text{v}$
$2\text{v}$
An electron is moving towards x-axis. An electric field is along y-direction then path of electron is
|
(a) Circular |
(b) Elliptical |
(c) Parabola |
(d) None of these |
The frequency of a light ray is 6 
. Its frequency when it propagates in a medium of refractive index 1.5, will be
|
(a) 1.67 |
(b) 9.10 |
(c) 6 |
(d) 4 |
A straight wire carrying a current 10 A is bent into a semicircular arc of radius 5 cm. The magnitude of magnetic field at the center is
|
(a) 1.5 |
(b) 3.14 |
(c) 6.28 |
(d) 19.6 |
A two metre wire is moving with a velocity of 1 m/sec perpendicular to a magnetic field of 0.5 weber/m2. The e.m.f. induced in it will be
|
(a) 0.5 volt |
(b) 0.1 volt |
(c) 1 volt |
(d) 2 volt |
By corpuscular theory of light, the phenomenon which can be explained is
|
(a) Refraction |
(b) Interference |
(c) Diffraction |
(d) Polarisation |
Two rays A and B being reflected by a mirror and going as A' and B'. The mirror:
