- 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.
At noon the sun appears white because:
Moment of inertia of a magnetic needle is 40 gm-cm2 has time period 3 seconds in earth's horizontal field = 3.6
weber/m2. Its magnetic moment will be
|
(a) 0.5 |
(b) 5 |
(c) 0.250 |
(d) 5 |
Assertion : Current is passed through a metallic wire, heating it red. When cold water is poured on half of its portion, then rest of the half portion become more hot.
Reason : Resistances decreases due to decrease in temperature and so current through wire increases.
|
(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. |
Which of the following particles are constituents of the nucleus
|
(a) Protons and electrons |
(b) Protons and neutrons |
|
(c) Neutrons and electrons |
(d) Neutrons and positrons |