In the Young's double slit experiment, if the phase difference between the two waves interfering at a point is ∅, the intensity at that point can be expressed by the expression (Where A and B depend upon the amplitudes of the two waves)
|
(a) I = |
(b) I = |
(c) I = A + Bcos |
(d) I = A + B Cos∅ |
(d) I = A + B Cos∅
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Relation between critical angles of water and glass is
|
(a) Cw > Cg |
(b) Cw < Cg |
(c) Cw = Cg |
(d) Cw = Cg = 0 |
An iron rod of volume 
and relative permeability 1000 is placed inside a long solenoid wound with 5 turns/cm. If a current of 0.5 A is passed through the solenoid, then the magnetic moment of the rod is
|
(a) 10 |
(b) 15 |
(c) 20 |
(d) 25 |
The time constant of an LR circuit represents the time in which the current in the circuit
|
(a) Reaches a value equal to about 37% of its final value |
|
(b) Reaches a value equal to about 63% of its final value |
|
(c) Attains a constant value |
|
(d) Attains 50% of the constant value |
Which of the following waves have the maximum wavelength
|
(a) X-rays |
(b) I.R. rays |
(c) UV rays |
(d) Radio waves |
Two concentric coplanar circular loops of radii 
and 
carry currents of respectively 
and 
in opposite directions (one clockwise and the other anticlockwise.) The magnetic induction at the centre of the loops is half that due to alone at the centre. If 
. the value of 
is
|
(a) 2 |
(b) 1/2 |
(c) 1/4 |
(d) 1 |
