The current in a coil changes from 4 ampere to zero in 0.1 s. If the average e.m.f. induced is 100 volt, what is the self inductance of the coil
|
(a) 2.5 H |
(b) 25 H |
(c) 400 H |
(d) 40 H |
(a) 2.5 H
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Two infinitely long parallel conducting plates having surface charge densities +σ and -σ respectively, are separated by a small distance. The medium between the plates is vacuum. If 
is the dielectric permittivity of vacuum, then the electric field in the region between the plates is
|
(a) 0 volts/meter |
(b) |
(c) |
(d) |
In the Young’s double slit experiment with sodium light. The slits are 0.589 m a part. The angular separation of the third maximum from the central maximum will be (given 𝜆 = 589 mm)
|
(a) |
(b) |
(c) |
(d) |
The average life T and the decay constant λ of a radioactive nucleus are related as
|
(a) T λ = 1 |
(b) T = |
(c) |
(d) T = |
Refractive index for a material for infrared light is
|
(a) Equal to that of ultraviolet light |
|
(b) Less than for ultraviolet light |
|
(c) Equal to that for red colour of light |
|
(d) Greater than that for ultraviolet light |
