The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refraction index n) is
|
(a) |
(b) |
(c) |
(d) |
(d) 
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A long straight wire carrying current of 30A is placed in an external uniform magnetic field of induction 4 × 10–4 T. The magnetic field is acting parallel to the direction of current. The magnitude of the resultant magnetic induction in tesla at a point 2.0 cm away from the wire is
|
(a) 10–4 |
(b) 3 × 10–4 |
(c) 5 × 10–4 |
(d) 6 × 10–4 |
The mass of an a-particle is
|
(a) Less than the sum of masses of two protons and two neutrons |
|
(b) Equal to mass of four protons |
|
(c) Equal to mass of four neutrons |
|
(d) Equal to sum of masses of two protons and two neutrons |
