Physics-
General
Easy
Question
A charged particle q is shot towards another charged particle Q which is fixed, with a speed v. It approaches Q upto a closest distance 
and then returns. If 
was given a speed 
, the closest distance of approach would be
The correct answer is:
Let a particle of change having velocity v approaches Q upto a closest distance and if the velocity becomes , the closest distance will be .’
The law of conservation of energy yields,
Kinetic energy of particle=electric potential energy between them at closest distance of approach.
Or 
Or 
(i)
and 
(ii)
Dividing Eq. (i) by Eq.(ii),
=
Related Questions to study
physics-
The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is
The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is
physics-General
physics-
A cyclic process ABCDA is shown below in the given p-V diagram. In the following answers the one that represents the same process as in p-V diagram
A cyclic process ABCDA is shown below in the given p-V diagram. In the following answers the one that represents the same process as in p-V diagram
physics-General
physics-
Work done in the given cyclic process is
Work done in the given cyclic process is
physics-General
physics-
An ideal gas is taken from point A to the point B, as shown in the p-V diagram, keeping the temperature constant. The work done in the process is
An ideal gas is taken from point A to the point B, as shown in the p-V diagram, keeping the temperature constant. The work done in the process is
physics-General
physics-
The p-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system in going from 
is 30 J, and 40 J heat is given to the system. The change in internal energy between A and C is
The p-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system in going from is 30 J, and 40 J heat is given to the system. The change in internal energy between A and C is
physics-General
physics-
A sample of ideal monoatomic gas is taken round the cycle ABCA as shown in the figure. The work done during the cycle is
A sample of ideal monoatomic gas is taken round the cycle ABCA as shown in the figure. The work done during the cycle is
physics-General
physics-
When a system is taken from state 
to state 
along the path 
, it is found that Q=50 cal and W=20 cal. Along the path 
, Q=36 cal. W along the path is
When a system is taken from state to state along the path , it is found that Q=50 cal and W=20 cal. Along the path , Q=36 cal. W along the path is
physics-General
physics-
The p-V diagram of a gas undergoing a cyclic process (ABCDA) is shown in the graph where p is in units of 
and V in 
Identify the incorrect statement.
The p-V diagram of a gas undergoing a cyclic process (ABCDA) is shown in the graph where p is in units of and V in Identify the incorrect statement.
physics-General
physics-
One mole of an ideal gas having initial volume V, pressure 2p and temperature T undergoes a cyclic process ABCDA as shown below.
The net work done in the complete cycle is
One mole of an ideal gas having initial volume V, pressure 2p and temperature T undergoes a cyclic process ABCDA as shown below.
The net work done in the complete cycle is
physics-General
physics-
In the given p-V diagram, I is the initial state and F is the final state
The gas goes from I to F by
i) IAF
ii) IBF
iii) ICF
The heat absorbed by gas is
In the given p-V diagram, I is the initial state and F is the final state
The gas goes from I to F by
i) IAF
ii) IBF
iii) ICF
The heat absorbed by gas is
physics-General
physics-
An ideal gas expands along the path AB as shown in the p-V diagram. The work done is
An ideal gas expands along the path AB as shown in the p-V diagram. The work done is
physics-General
physics-
A system goes from A to B via two processes I and II as shown in figure. If 
are the changes in internal energies in the processes I and II respectively, then
A system goes from A to B via two processes I and II as shown in figure. If are the changes in internal energies in the processes I and II respectively, then
physics-General
physics-
An ideal monoatomic gas is taken around the cycle ABCD as shown in the p-V diagram. The work done during the cycle is given by
An ideal monoatomic gas is taken around the cycle ABCD as shown in the p-V diagram. The work done during the cycle is given by
physics-General
physics-
The p-V diagram of 2 g of helium gas for a certain process 
is shown in the figure. What is the heat given to the gas during the process 
The p-V diagram of 2 g of helium gas for a certain process is shown in the figure. What is the heat given to the gas during the process
physics-General
Maths-
From the given figure ,what is the value of ‘P’ ?
From the given figure ,what is the value of ‘P’ ?
Maths-General
