- AUndergoes acceleration all the time.
- BSpeeds up between the dees because of the magnetic field.
- CSpeeds up in a dees.
- DSlows down within a dee and speeds up between dees.
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At what distance from a convex lens of focal length 30 cm, an object should be placed so that the size of the image be 1/2 of the object
|
(a) 30 cm |
(b) 60 cm |
(c) 15 cm |
(d) 90 cm |
In the Bohr model of the hydrogen atom, let R, v and E represent the radius of the orbit, the speed of electron and the total energy of the electron respectively. Which of the following quantity is proportional to the quantum number n
|
(a) R/E |
(b) E/v |
(c) RE |
(d) vR |
An electron is accelerated through a potential difference of 200 volts. If e/m for the electron be 1.6
coulomb/kg, the velocity acquired by the electron will be
|
(a) 8 |
(b) 8 |
(c) 5.9 |
(d) 5.9 |
In a wire of circular cross-section with radius r, free electrons travel with a drift velocity V when a current I flows through the wire. What is the current in another wire of half the radius and of the same material when the drift velocity is 2V
|
(a) 2I |
(b) I |
(c) I/2 |
(d) I/4 |
The capacities of two conductors are and
and their respective potentials are
and
. If they are connected by a thin wire, then the loss of energy will be given by
|
(a) |
(b) |
(c) |
(d) |