The given figure represents a material which is
|
(a) Paramagnetic |
(b) Diamagnetic |
(c) Ferromagnetic |
(d) None of these |
The given figure represents a material which is
|
(a) Paramagnetic |
(b) Diamagnetic |
(c) Ferromagnetic |
(d) None of these |
(b) Diamagnetic
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A coil of wire having finite inductance and resistance has a conducting ring placed coaxially within it. The coil is connected to a battery at time t = 0, so that a time-dependent current
starts flowing through the coil. If
is the current induced in the ring. and B(t) is the magnetic field at the axis of the coil due to
, then as a function of time (t > 0), the product I2 (t) B(t)
|
(a) Increases with time |
(b) Decreases with time |
|
(c) Does not vary with time |
(d) Passes through a maximum |
Assertion : A paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled.
Reason : The magnetisation does not depend on temperature.
|
(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. |
In the given figure, when key K is opened, the reading of the ammeter A will be
|
(a) 50 A |
(b) 2 A |
(c) 0.5 A |
(d) |
If half life of radium is 77 days. Its decay constant in day will be
|
(a) 3 |
(b) |
(c) 1 |
(d) 6 |

The relaxation time in conductors
|
(a) Increases with the increase of temperature |
|
(b) Decreases with the increase of temperature |
|
(c) It does not depend on temperature |
|
(d) All of sudden changes at 400 K |
What is the effect on Fresnel’s biprism experiment when the use of white light is made
|
(a) Fringe are affected |
|
(b) Diffraction pattern is spread more |
|
(c) Central fringe is white and all are coloured |
|
(d) None of these |