- ADecrease, increase
- BIncrease, increase
- CIncrease, decrease
- DDecrease, decrease
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The relative permeability is represented by mr and the susceptibility is denoted by c for a magnetic substance. Then for a paramagnetic substance
|
(a) mr < 1, c < 0 |
(b) mr < 1, c > 0 |
(c) mr > 1, c < 0 |
(d) mr > 1, c > 0 |
What will be the colour of sky as seen from the earth, if there were no atmosphere
|
(a) Black |
(b) Blue |
(c) Orange |
(d) Red |
How does the red shift confirms that the universe is expanding
|
(a) Due to Wien's law |
(b) Due to Stefan's law |
|
(c) Due to Kirchhoff's law |
(d) Due to Doppler's effect |
The number of turns in the coil of an ac generator is 5000 and the area of the coil is
. The coil is rotated at the rate of 100 cycles/sec in a magnetic field of 0.2
. The peak value of the emf generated is nearly
|
(a) 786 kV |
(b) 440 kV |
(c) 220 kV |
(d) 157.1 kV |
The direction of current in an iron-copper thermocouple is
|
(a) From copper to iron at the hot junction |
(b) From iron to copper at the hot junction |
|
(c) From copper to iron at cold junction |
(d) No current will flow |