MCQ
A current carrying loop is placed in a uniform magnetic field. The torque acting on it does not depend upon:
- AShape of the loop.
- BArea of the loop.
- CValue of the current.
- DMagnetic field.
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Curie is a unit of
|
(a) Length |
(b) It is not any unit |
(c) Activity |
(d) Atomic number |
When electrons are removed from a neutral metal plate, the electric charge on it is
|
(a) – 1.6 C |
(b) + 1.6 C |
(c) 10 +19 C |
(d) 10–19 C |
Two lenses have focal lengths and
and their dispersive powers are
and
respectively. They will together form an achromatic combination if
|
(a) |
(b) |
|
(c) |
(d) |
The magnetic moment of a magnet of length 10 cm and pole strength 4.0 Am will be
|
(a) |
(b) 1.6 |
(c) 20 |
(d) 8.0 |
By Huygen's wave theory of light, we cannot explain the phenomenon of
|
(a) Interference |
(b) Diffraction |
(c) Photoelectric effect |
(d) Polarisation |