Advertisements
Advertisements
प्रश्न
A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is ______.
विकल्प
same as the same force law is involved in the two experiments.
less for the case of a positron, as the positron moves away more rapidly and the force on it weakens.
more for the case of a positron, as the positron moves away a larger distance.
same as the work done by charged particle on the stationary proton.
Advertisements
उत्तर
A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is more for the case of a positron, as the positron moves away a larger distance.
Explanation:
The force between two protons is equal to the force between proton and a positron because their charges are the same. As the mass of positron is much lesser than the proton, (1/1840 times) it moves away through a much larger distance compared to the proton.
Change in their momentum will be the same. So, the velocity of a lighter particle will be greater than that of a heavier particle. So, the positron is moved through a larger distance.
As work done = force x distance. As forces are the same in case of proton and positron but distance moved by positron is larger, hence, work done will be more.
APPEARS IN
संबंधित प्रश्न
Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?
Work done = Force × ........................................
Define work.
State two factors on which the work done on a body depends.
A car is running at a speed of 15 km h-1 while another similar car is moving at a speed of 45 km h-1. Find the ratio of their kinetic energies.
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
Give an example
Light energy changes to electrical energy.
How is horse power related to the S. I. unit of power?
Can two agents, doing the same work, have different power?
What should be the characteristic of a source of energy?
A bucketful of water is to be drawn from a well ______ will be done when a ______ is applied to do this because there will be a ______ of water.
(displacement, work, force)
A body of mass 0.5 kg travels on straight line path with velocity v = (3x2 + 4) m/s. The net work done by the force during its displacement from x = 0 tox = 2 m is ______.
