When a current passes through a wire whose different parts are maintained at different temperatures, evolution or absorption of heat all along the length of wire is known as
|
(a) Joule effect |
(b) Seebeck effect |
(c) Peltier effect |
(d) Thomson effect |
(d) Thomson effect
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A rocket is going towards moon with a speed v. The astronaut in the rocket sends signals of frequency v towards the moon and receives them back on reflection from the moon. What will be the frequency of the signal received by the astronaut (Take v << c)
|
(a) |
(b) |
(c) |
(d) |
X-rays are produced due to
| (a) Break up of molecules | (b) Changing in atomic energy level |
| (c) Changing in nuclear energy level | (d) Radioactive disintegration |
$\text{f}=\frac{\text{R}}{2}$
$\text{f}=\text{R}$
$\text{f}=-\text{R}$
$\text{f}=2\text{R}$
The strength of the magnetic field at a point r near a long straight current carrying wire is B. The field at a distance 
will be
|
(a) |
(b) |
(c) 2B |
(d) 4B |
