A coil having an area 
is placed in a magnetic field which changes from 
to 
in a interval of 2 second. The e.m.f. induced in the coil will be
|
(a) 4 V |
(b) 3 V |
(c) 1.5 V |
(d) 2 V |
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In which of the following is the interference due to the division of wave front
|
(a) Young's double slit experiment |
(b) Fresnel's biprism experiment |
|
(c) Lloyd's mirror experiment |
(d) Demonstration colours of thin film |
If a high power heater is connected to electric mains, then the bulbs in the house become dim, because there is a
|
(a) Current drop |
(b) Potential drop |
(c) No current drop |
(d) No potential drop |
Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that of Q decreases. We conclude that
|
(a) P and Q are conductors of different materials |
|
(b) P is N-type semiconductor and Q is P-type semiconductor |
|
(c) P is semiconductor and Q is conductor |
|
(d) P is conductor and Q is semiconductor |
In a biprism experiment, by using light of wavelength 5000 Å, 5 mm wide fringes are obtained on a screen 1.0 m away from the coherent sources. The separation between the two coherent sources is
|
(a) 1.0 mm |
(b) 0.1 mm |
(c) 0.05 mm |
(d) 0.01 mm |