- AConservation of energy.
- BConservation of charge.
- CConservation of electric potential.
- DConservation of electric flux.
Explanation:
Kirchhoff's junction rule is an application of the principle of conservation of electric charge: current is flow of charge per time, and if current is constant, that which flows into a point in a circuit must equal that which flows out of it.
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The k line of singly ionised calcium has a wavelength of 393.3 nm as measured on earth. In the spectrum of one of the observed galaxies, this spectral line is located at 401.8 nm. The speed with which the galaxy is moving away from us, will be
|
(a) 6480 km/s |
(b) 3240 km/s |
(c) 4240 km/sec |
(d) None of these |
The heat developed in an electric wire of resistance R by a current I for a time t is
|
(a) |
(b) |
(c) |
(d) |
A bright star is indicated to have a brightness magnitude of – 5 compared to a star of brightness zero magnitude. It means that this star compared to the reference star of zero brightness is
|
(a) 100 times less bright |
(b) 5 times more bright |
|
(c) 5 times less bright |
(d) 100 times more bright |
A neon sign does not produce
|
(a) Line spectrum |
(b) An emission spectrum |
|
(c) An absorption spectrum |
(d) Photons |
The electric field due to an electric dipole at a distance r from its centre in axial position is E. If the dipole is rotated through an angle of 90° about its perpendicular axis, the electric field at the same point will be
|
(a) E |
(b) E/4 |
(c) E/2 |
(d) 2E |
By properly combining two prisms made of different materials, it is possible to: