- Aincrease
- Bdecrease
- Ceither increase or decrease
- Dnone of the above
Explanation:
LPT= leading pole tip
TPT= tailling pole top
Considering armature reaction.
where GNA=Geometrical axis
MNA=Magnetic neutral axis
here clearly see that TPT side flux increases due to armature in case of generator.
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If an electron jumps from 1st orbital to 3rd orbital, then it will
|
(a) Absorb energy |
(b) Release energy |
|
(c) No gain of energy |
(d) None of these |
Heat produced in a wire of resistance R due to current flowing at constant potential difference is proportional to
|
(a) |
(b) |
(c) R |
(d) |
de-Broglie wavelength of a body of mass m and kinetic energy E is given by
|
(a) |
(b) |
(c) |
(d) |
In a hydrogen atom, the distance between the electron and proton is 2.5
. The electrical force of attraction between them will be
|
(a) 2.8 |
(b) 3.7 |
(c) 6.2 |
(d) 9.1 |
Why are red coloured lights are used in traffic signals to stop the vehicles?
Angular width of central maxima in the Fraunhoffer diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength 6000 Å. When the slit is illuminated by light of another wavelength, the angular width decreases by 30%. The wavelength of this light will be
|
(a) 6000 Å |
(b) 4200 Å |
(c) 3000 Å |
(d) 1800 Å |