Two straight long conductors AOB and COD are perpendicular to each other and carry currents 
and 
. The magnitude of the magnetic induction at a point P at a distance a from the point O in a direction perpendicular to the plane ACBD is
|
(a) |
(b) |
(c) |
(d) |
(c) 
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The momentum of a photon in an X-ray beam of 
metre wavelength is
|
(a) 1.5 |
(b) 6.6 |
|
(c) 6.6 |
(d) 2.5 |
The (𝜏 – 𝜃) graph for a coil is
|
(a)
|
(b)
|
(c)
|
(d)
|
The magnetic needle of a tangent galvanometer is deflected at an angle 30o due to a magnet. The horizontal component of earth’s magnetic field 0.34 × 10–4 T is along the plane of the coil. The magnetic intensity is
|
(a) 1.96 × 10–4 T |
(b) 1.96 × 10–5 T |
(c) 1.96 × 104 T |
(d) 1.96 × 105 T |
A diverging beam of light from a point source S having divergence angle a, falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and the refractive index n, then the divergence angle of the emergent beam is
|
(a) Zero |
(b) α |
(c) |
(d) 2 |
