- A$v_d$ will remain constant
- ✓$v_d \propto E$
- C$v_d \propto \frac{1}{ E }$
- Dnone of the above
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A thin spherical conducting shell of radius R has a charge q. Another charge Q is placed at the centre of the shell. The electrostatic potential at a point p a distance
from the centre of the shell is
|
(a) |
(b) |
(c) |
(d) |
$\text{zero}$
$\frac{1}{8}\omega\text{Bl}^2$
$\frac{1}{2}\omega\text{Bl}^2$
$\text{B}\omega\text{l}^2$
A magnifying glass is used to read the newspaper. As it is moved far away from the newspaper:
Which of the following is true for photon
|
(a) E = |
(b) E = |
(c) p = |
(d) E = |
Monochromatic light is refracted from air into the glass of refractive index μ. The ratio of the wavelength of incident and refracted waves is
|
(a) 1 : μ |
(b) 1 : |
(c) μ : 1 |
(d) 1 : 1 |
The distance between a proton and electron both having a charge 1.6
of a hydrogen atom is
. The value of intensity of electric field produced on electron due to proton will be
|
(a) 2.304 |
(b) 14.4 V/m |
(c) 16 V/m |
(d) 1.44 |
Which of the following statement is incorrect
|
(a) Both ac and dc dynamo have a field magnet |
|
(b) Both ac and dc dynamo have an armature |
|
(c) Both ac and dc dynamo convert mechanical energy into electrical energy |
|
(d) Both ac and dc dynamo have slip rings |
Two identical heaters rated 220 volt, 1000 watt are placed in series with each other across 220 volt lines. If resistance do not change with temperature, then the combined power is
|
(a) 1000 watt |
(b) 2000 watt |
(c) 500 watt |
(d) 4000 watt |