- AWe will have a single pole on each piece.
- BEach piece will have two unlike poles.
- CEach piece will have two like poles.
- DNone of these.
Explanation:
When we break a magnet into two, both act as magnets, that is both have a north and south pole each. In both these pieces the corresponding north and south poles remain on the sides as in the original magnet. This means that the 2 broken sides must get oppositely polarized.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
An eye specialist prescribes spectacles having a combination of convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power of this lens combination in diopters is
|
(a) + 1.5 |
(b) – 1.5 |
(c) + 6.67 |
(d) – 6.67 |
A bar magnet when placed at an angle of 30o to the direction of magnetic field induction of 5 × 10–2 T, experiences a moment of couple 25 × 10–6 N-m. If the length of the magnet is 5 cm its pole strength is
|
(a) 2 × 10–2 A-m |
(b) 5 × 10–2 A-m |
(c) 2 A-m |
(d) 5 A-m |
Light of wavelength 589.3 nm is incident normally on the slit of width 0.1 mm. What will be the angular width of the central diffraction maximum at a distance of 1 m from the slit
|
(a) 0.68° |
(b) 1.02° |
(c) 0.34° |
(d) None of these |
A potential barrier of 0.50 V exists across a P-N junction. If the depletion region is 5.0
m wide, the intensity of the electric field in this region is
|
(a) 1.0 |
(b) 1.0 |
(c) 2.0 |
(d) 2.0 |
In good conductors of electricity, the type of bonding that exists is
|
(a) Ionic |
(b) Vander Waals |
(c) Covalent |
(d) Metallic |
A metal surface of work function 1.07 eV is irradiated with light of wavelength 332 nm. The retarding potential required to stop the escape of photo-electrons is
|
(a) 4.81 eV |
(b) 3.74 eV |
(c) 2.66 eV |
(d) 1.07 eV |