A proton accelerated by a potential difference 500 KV moves though a transverse magnetic field of 0.51T as shown in figure. The angle θ through which the proton deviates from the initial direction of its motion is
|
(a) 15° |
(b) 30° |
(c) 45° |
(d) 60° |
(b) 30°
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A charge q coulomb moves in a circle at n revolutions per second and the radius of the circle is r metre. Then magnetic field at the centre of the circle is
|
(a) |
(b) |
|
(c) |
(d) |
The minimum wavelength of photon is 5000 Å, its energy will be
|
(a) 2.5 eV |
(b) 50 V |
(c) 5.48 eV |
(d) 7.48 eV |
Two wires of the same material and equal length are joined in parallel combination. If one of them has half the thickness of the other and the thinner wire has a resistance of 8 ohms, the resistance of the combination is equal to
|
(a) |
(b) |
(c) |
(d) |
In an hydrogen atom, the electron revolves around the nucleus in an orbit of radius 0.53 
. Then the electrical potential produced by the nucleus at the position of the electron is
|
(a) – 13.6 V |
(b) – 27.2 V |
(c) 27.2 V |
(d) 13.6 V |
A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are joined together. The power of the combination will be
|
(a) – 16 D |
(b) + 16 D |
(c) – 6 D |
(d) + 6 D |
