In a uniform magnetic field of $$0.049 \mathrm{~T}$$, a magnetic needle performs 20 complete oscillations in 5 seconds as shown. The moment of inertia of the needle is $$9.8 \times 10^{-6} \mathrm{~kg} \mathrm{~m}^2$$. If the magnitude of magnetic moment of the needle is $$x \times 10^{-5} \mathrm{~Am}^2$$, then the value of '$$x$$' is :
In the above diagram, a strong bar magnet is moving towards solenoid-2 from solenoid-1. The direction of induced current in solenoid-1 and that in solenoid-2, respectively, are through the directions:
Match List I with List II
| List I (Material) |
List II (Susceptibility ($$\chi)) |
||
|---|---|---|---|
| A. | Diamagnetic | I. | $$\chi=0$$ |
| B. | Ferromagnetic | II. | $$0 > \chi \ge -1$$ |
| C. | Paramagnetic | III. | $$\chi >> 1$$ |
| D. | Non-magnetic | IV. | $$0 < \chi < \varepsilon$$ (a small positive number) |
Choose the correct answer from the options given below.
A sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to:
A. hold the sheet there if it is magnetic.
B. hold the sheet there if it is non-magnetic.
C. move the sheet away from the pole with uniform velocity if it is conducting.
D. move the sheet away from the pole with uniform velocity if it is both, non-conducting and non-polar.
Choose the correct statement(s) from the options given below: