Question
In two separate experiments the neutral points due to two small magnets are at a distance of r and 2r in broad side-on position. The ratio of their magnetic moments will be
| (a) 4 : 1 | (b) 1 : 2 | (c) 2 : 1 | (d) 1 : 8 |
✓
Answer
(d) 1 : 8
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The maximum value of stopping potential in the following diagram is
|
(a) – 4V |
(b) – 1V |
(c) – 3V |
(d) – 2V |
50% of the X-rays coming from a Coolidge tube are able to pass through a 0.1mm thick aluminium foil. If the potential difference between the target and the filament is increased, the fraction of the X-rays passing through the same foil will be:
The central fringe obtained in the diffraction pattern of a single slit is :
Fission of nuclei is possible because the binding energy per nucleon in them
|
(a) Increases with mass number at high mass numbers |
|
(b) Decreases with mass number at high mass numbers |
| (c) Increases with mass number at low mass numbers |
| (d) Decreases with mass number at low mass numbers |
An electric motor operating on a 60 V dc supply draws a current of 10 A. If the efficiency of the motor is 50%, the resistance of its winding is
|
(a) 3Ω |
(b) 6 Ω |
(c) 15 Ω |
(d) 30 Ω |
Assertion : Red shift confirms that the universe is expanding
Reason : Wavelength of red light is maximum in the visible region
|
(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. |
If a transparent medium of refractive index m = 1.5 and thickness t = 2.5 × 10–5 m is inserted in front of one of the slits of Young’s Double Slit experiment, how much will be the shift in the interference pattern? The distance between the slits is 0.5 mm and that between slits and screen is 100 cm
|
(a) 5 cm |
(b) 2.5 cm |
(c) 0.25 cm |
(d) 0.1 cm |
If the potential difference applied across X-ray tube is V volts, then approximately minimum wavelength of the emitted X-rays will be
|
(a) |
(b) |
(c) |
(d) |
A double convex lens of focal length 20 cm is made of glass of refractive index 3 / 2. When placed completely in water (a
, its focal length will be
|
(a) 80 cm |
(b) 15 cm |
(c) 17.7 cm |
(d) 22.5 cm |
A blackbody does not:
- Emit radiation.
- Absorb radiation.
- Reflect radiation.
- Refract radiation.