- AA point always has a single net magnetic field.
- BThe lines have similar charges and so repel each other.
- CThe lines always diverge from a single force.
- DThe lines need magnetic lenses to be made to interest.
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The forbidden gap in the energy bands of germanium at room temperature is about
|
(a) 1.1 eV |
(b) 0.1 eV |
(c) 0.67 eV |
(d) 6.7 eV |
A flat circular disc has a charge +Q uniformly distributed on the disc. A charge +q is thrown with kinetic energy E towards the disc along its normal axis. The charge q will
|
(a) Hit the disc at the centre |
|
(b) Return back along its path after touching the disc |
|
(c) Return back along its path without touching the disc |
|
(d) Any of the above three situations is possible depending on the magnitude of E |
In hydrogen atom, the electron makes 6.6 revolutions per second around the nucleus in an orbit of radius 0.5
. It is equivalent to a current nearly
|
(a) 1 A |
(b) 1 mA |
(c) 1 μA |
(d) 1.6 |
When the length of a microscope tube increases, its magnifying power:
If two streams of protons move parallel to each other in the same direction, then they
|
(a) Do not exert any force on each other |
|
(b) Repel each other |
|
(c) Attract each other |
|
(d) Get rotated to be perpendicular to each other |