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There are certain material developed in laboratories which have a negative refractive index (Fig). A ray incident from air (medium 1) into such a medium (medium 2) shall follow a path given by:
In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is:
Two identical induction coils each of inductance L joined in series are placed very close to each other such that the winding direction of one is exactly opposite to that of the other, what is the net inductance
|
(a) L2 |
(b) 2L |
(c) L/2 |
(d) Zero |
In the above question, the power lost in the cable during transmission is
|
(a) 12.5 kW |
(b) 6.25 kW |
(c) 25 kW |
(d) 3.15 kW |
Asteroids are
|
(a) Small planets |
(b) Shooting stars |
|
(c) Found in a belt between Earth ad Venus |
(d) None of these |
The capacities of two conductors are 
and 
and their respective potentials are 
and 
. If they are connected by a thin wire, then the loss of energy will be given by
|
(a) |
(b) |
(c) |
(d) |
