| Message |
|
|
|
Nikhil is perfectly right. Line of magnetic field gives direction of magnetic field. Thus the right statement about magnetic field lines would be that if a charge has a velocity along the line of magnetic field no magnetic forc will act on it
|
|
|
|
|
The concept of F= F in vaccum/K comes from the fact that E = E in vaccum /K and is ment for dielectrics and is a condition for of electrostatics ie. a condition when equillibrium is achieved. While when you talk of a charge placed in metal it will flow towards the urface and that does not comes under electrostatics
|
|
|
|
|
Urva please check google or wikipedia for this purpose. think it will be difficult for us to help u in this regard
|
|
|
|
Let the length of escalator is l.
vel of man = l/5
vel of escalator = l/2
So velocity of man moving on moving escalator = l/2+l/5
So time taken = l/(l/2+l/5) =10/7 min
|
|
|
|
|
induce emf opposes the change in flux and not the flux itself
|
|
|
|
speed of minute hand is 2*pi rad per hour
speed of hour hand is pi/6 rad per hour
Let they concide after t hrs
So t*(2pi-pi/6) = 2pi
or t = 12/11 hrs
|
|
|
|
|
HI SMA, in emi emf is induced in the circuit when there is change of magnetic flux through it. The real cause of this is the fact that such changing flux produces rotating electric field in the space.
|
|
|
|
|
The exact figure is not clear to me as in how you are inserting the coin. But i think its because of rotation of coin. Look at the moment of forces acting on the coin.
|
|
|
|
|
|
please ask a specific question
|
|
|
|
|
It will be zero. Because three equall forces acting at 120 degree to each other will have zero resultant
|
|
|
|
|
it is (h/(mc))*(1-cos(theta))
where m is mass of electron and c is velocity of light. This is compton scattering but i think it is out of sylabus
|
|
|
|
photons is a subset of em radiatiations which is a subset of waves.
So energy is travelling in form of em radiations (Some of them are photons as well). And these radiations are waves in general
|
|
|
|
|
