The electric field inside a spherical shell of uniform surface charge density is
|
(a) Zero |
|
(b) Constant, less than zero |
|
(c) Directly proportional to the distance from the centre |
|
(d) None of the above |
(a) Zero
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A proton of mass m and charge +e is moving in a circular orbit in a magnetic field with energy 1 MeV. What should be the energy of α - particle (mass = 4m and charge = + 2e), so that it can revolve in the path of same radius
|
(a) 1 MeV |
(b) 4 MeV |
(c) 2 MeV |
(d) 0.5 MeV |
In the adjoining diagram, a wavefront AB, moving in air is incident on a plane glass surface XY. Its position CD after refraction through a glass slab is shown also along with the normals drawn at A and D. The refractive index of glass with respect to air (μ = 1) will be equal to
|
(a) |
(b) |
(c) |
(d) |
A straight conductor carries a current of 5A. An electron travelling with a speed of 5 
parallel to the wire at a distance of 0.1m from the conductor, experiences a force of
|
(a) 8 |
(b) 3.2 |
(c) 8 |
(d) 1.6 |
X-rays were discovered by
| (a) Becquerel | (b) Roentgen | (c) Marie Curie | (d) Von Laue |
