- AOn elasticity of the medium only.
- BOn inertia of the medium only.
- COn elasticity as well as inertia.
- DNeither on elasticity nor on inertia.
Explanation:
The speed of light in any medium depends on the refractive index of that medium, which is an intensive property. Hence, speed of light is not affected by the elasticity and inertia of the medium.
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An electron (mass = 9.1
kg; charge = 1.6
C) experiences no deflection if subjected to an electric field of 3.2
V/m, and a magnetic fields of 2.0
Wb/m2. Both the fields are normal to the path of electron and to each other. If the electric field is removed, then the electron will revolve in an orbit of radius
|
(a) 45 m |
(b) 4.5 m |
(c) 0.45 m |
(d) 0.045 m |
In which of the following the final image is erect?
The magnetic flux linked with a coil, in webers, is given by the equations ∅ =
Then the magnitude of induced e.m.f. at t = 2 second will be
|
(a) 2 volt |
(b) 4 volt |
(c) 8 volt |
(d) 16 volt |
A uniform magnetic field acts at right angles to the direction of motion of electrons. As a result, the electron moves in a circular path of radius 2 cm. If the speed of the electrons is doubled, then the radius of the circular path will be
|
(a) 2.0 cm |
(b) 0.5 cm |
(c) 4.0 cm |
(d) 1.0 cm |
Three fourth of the active decays in a radioactive sample in 3/4 sec. The half life of the sample is
|
(a) |
(b) 1 sec |
(c) |
(d) |
Assertion : The ferromagnetic substance do not obey Curie’s law.
Reason : At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |