- AKinetic energy changes, but the momentum is constant.
- BThe momentum changes, but the kinetic energy is constant.
- CBoth momentum and kinetic energy of the particle are not constant.
- DBoth momentum and kinetic energy of the particle are constant.
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A hollow conducting sphere is placed in an electric field produced by a point charge placed at P as shown in figure. Let be the potentials at points A, B and C respectively. Then
|
(a) |
(b) |
(c) |
(d) |
Cyclotron is used to accelerate
|
(a) Electrons |
(b) Neutrons |
(c) Positive ions |
(d) Negative ions |
The V-i graph for a conductor at temperature and
are as shown in the figure. (
is proportional to
|
(a) cos2θ |
(b) sin θ |
(c) cot 2θ |
(d) tan θ |
The current in a conductor varies with time t as where I is in ampere and t in seconds. Electric charge flowing through a section of the conductor during t = 2 sec to t = 3 sec is
|
(a) 10 C |
(b) 24 C |
(c) 33 C |
(d) 44 C |
A diver in a swimming pool wants to signal his distress to a person lying on the edge of the pool by flashing his water proof flash light
|
(a) He must direct the beam vertically upwards |
|
(b) He has to direct the beam horizontally |
|
(c) He has to direct the beam at an angle to the vertical which is slightly less than the critical angle of incidence for total internal reflection |
|
(d) He has to direct the beam at an angle to the vertical which is slightly more than the critical angle of incidence for the total internal reflection |