- AElectrons move from collector to base.
- BHoles move from emitter to base.
- CElectrons move from base to collector.
- DHoles move from base to emitter.
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$\text{Mr}^2$
$\frac{1}{2}\text{Mr}^2$
$\frac{1}4{}\text{Mr}^2$
$\frac{2}{5}\text{Mr}^2$
An e.m.f. of 100 millivolts is induced in a coil when the current in another nearby coil becomes 10 ampere from zero in 0.1 second. The coefficient of mutual induction between the two coils will be
|
(a) 1 millihenry |
(b) 10 millihenry |
(c) 100 millihenry |
(d) 1000 millihenry |
1 Curie is equal to
|
(a) 3 |
(b) 3.7 |
|
(c) 5 |
(d) 3.7 |
Which of the following (referred to a spherical mirror) do (does) not depend on whether the rays are paraxial or not?
The earth's magnetic field at a certain place has a horizontal component 0.3 Gauss and the total strength 0.5 Gauss. The angle of dip is
|
(a) |
(b) |
(c) |
(d) |
Rutherford’s a - particle experiment showed that the atoms have
|
(a) Proton |
(b) Nucleus |
(c) Neutron |
(d) Electrons |
The control rod in a nuclear reactor is made of
|
(a) Uranium |
(b) Cadmium |
(c) Graphite |
(d) Plutonium |