haruspex , I got hold of the original question paper today and have attached a screenshot of it. Please take a look at it to clearly understand the question , since I might not have explained it properly.
Since (dp/dt) = F = q(vXB) , hence if we can show that ∇X{d/dt( p + qA)} = 0 , it would...
Your thinking is correct.
Let us say that an object is submerged to a volume V in a given fluid . Then the fluid applies a force on the object ,which is equal to the force on an equal volume V of the fluid due to the rest of the fluid body. This force is equal and opposite to the weight of the...
Is there any condition given that M >> m . since in that case (1 + m/M) will tend to 1, and your expression will reduce to the required expression. I am also getting the same answer as you got.
I am sorry I forgot to add that in the question it was given that since ∇.B = 0 , therefore we can write B = ∇XA , where A is a vector. So I am not sure that we can use the transformation of ∇ in the expression.
Are you getting the same answer by keeping one end tied to the center of the triangle.
If one end is tied , then k*l = m*2l*(ω^2) which means k = 2m(ω^2)
Homework Statement
A particle of mass m and charge q moves in a region with a magnetic field B(r) which is time independent. What is \frac{dA}{dt} as seen by the particle. Homework Equations
The Attempt at a Solution
Since the B field is not varying with time, I know that the change in A will...
In Griffiths, for deriving the bound charges for a given polarization P , the formula used is the general formula for dipoles .i.e ( equation 4.9)
{Here the potential at r is calculated due to the dipole at r' )
V(r) = ∫\frac{x.P(r')}{X^2}d\tau'
Here X = r - r' , and x = unit vector in...
Just wanted to add , that in India students who wish to go for masters in physics have to appear for a national level test called Joint Admission test for MSc (JAM) . The questions are of the level that any above average physics BSc student can answer . I think they can also serve as a good...
Thanks for the reply.
What I wanted to know was, whether the entropy change of only the water in the two cases would be same or not. By the method I have used, I get the same entropy change for water in both the cases.
Homework Statement
1 kg of water with specific heat (C) of 4180 Joules /kg/degree is given at 0°C. It is taken to 100°C by two methods :-
(i) by bringing it in contact with a reservoir at 100°C.
(ii) by bringing it in contact with a reservoir at 50°C , and then with another reservoir at...
I am sorry, I made a mistake in my previous post. The mechanical energy of the entire chain would not be conserved , as some of this energy will be used to increase the internal energy of the table on the collision . So , the part of the chain which has not yet touched the table can be assumed...
Well ,there are only two forces acting on the chain , namely the gravitational force and the reaction forces . Now , the reaction forces do not do any work on the chain , as at their points of application , the displacement is zero. Therefore the net mechanical energy of the whole chain is...
you could read some books related to theoretical neuroscience, such as the one by Peter Dayan , to get a feel of the subject . But I feel as a physicist you will be disappointed at the lack of "theory" in neuroscience at present. there are a lot of " models " which have been proposed , but they...