Notes of O Level physics will be provided on this blog, for the guidance of students. Study through the whole O level physics 5054 syllabus, and get better grades!
A magnet usually divides into two poles whenever it is broken down. Some theories suggest that unipolar magnets can exist. Still, there has been no reliable proof of it so far. You can refer to the following pages for more information.
A student was conducting experiment on magnetic materials. He found repulsion between two pieces and wrote "similar poles". He also found attraction between two pieces and wrote "opposite poles". Which observation was correct?
The first observation is correct. This is because opposite poles always repel each other.
However, a magnet would pull any magnetic material e-g iron. Therefore we can't be sure from the second observation whether both the pieces are magnets or that one piece is just a magnetic material like iron, being pulled by the other magnet
Hi, I would like to ask about the brightness of bulb. Does it depends on voltage or current? There is one question that says a higher resistance will have a higher voltage and hence brighter. But I thought a higher resistance will have lower current and hence less bright.
In our syllabus, it has been mentioned about "Conventional Currents" that means the 'positive charges' or in other words we say current travels from the positive terminal of the battery and comes again in the negative terminal of the circuit. This theory, however, was wrong but we, in our syllabus, still use this theory and scientists as well. So, if you want to know the movement of electrons in a circuit then it is obviously going opposite to the conventional current i.e., from 'Negative Terminal' to 'Positive Terminal' of the battery.
the principle of moments states that when an object is in equilibrium, the sum of clockwise moments about a pivot is equal to the sum of anticlockwise moments about the same pivot
can a unipolar magnet exist?(my techer said it practically doesn't exist!what does he mean???)
ReplyDeleteHi Nagendra,
DeleteA magnet usually divides into two poles whenever it is broken down. Some theories suggest that unipolar magnets can exist. Still, there has been no reliable proof of it so far. You can refer to the following pages for more information.
http://en.wikipedia.org/wiki/Magnetic_monopole#Searches_for_magnetic_monopoles
Hope it helped.
P.S. It is not part of the O level syllabus.
A student was conducting experiment on magnetic materials. He found repulsion between two pieces and wrote "similar poles". He also found attraction between two pieces and wrote "opposite poles". Which observation was correct?
ReplyDeleteThe first observation is correct. This is because opposite poles always repel each other.
DeleteHowever, a magnet would pull any magnetic material e-g iron. Therefore we can't be sure from the second observation whether both the pieces are magnets or that one piece is just a magnetic material like iron, being pulled by the other magnet
Hi, I would like to ask about the brightness of bulb. Does it depends on voltage or current?
ReplyDeleteThere is one question that says a higher resistance will have a higher voltage and hence brighter.
But I thought a higher resistance will have lower current and hence less bright.
u must state whether the battery is fixed voltage or not-then we can answer.
DeleteSorry but is Force/Time graph in the syllabus?
ReplyDeleteno
DeleteDoes acceleration really exist or is just a phenomenon?
ReplyDeleteIt does exist
ReplyDeleteExplain why this way of placing glass slide is an inaccurate way of measurement. How can the value of width be improved significantly?
ReplyDeleteI have a got problem with convertions. plz help
ReplyDeletegive details-then can help u.
Deletehow to make free body diagram ?? plzz help me out
ReplyDeleteHow to add vectors in two dimensions? I mean the vectors with components...
ReplyDeletewhat is the position of electrons moving in a circuit??????
ReplyDeleteIn our syllabus, it has been mentioned about "Conventional Currents" that means the 'positive charges' or in other words we say current travels from the positive terminal of the battery and comes again in the negative terminal of the circuit. This theory, however, was wrong but we, in our syllabus, still use this theory and scientists as well. So, if you want to know the movement of electrons in a circuit then it is obviously going opposite to the conventional current i.e., from 'Negative Terminal' to 'Positive Terminal' of the battery.
Delete*comes again in the negative terminal of the battery after passing through the whole curcuit
DeleteWhat's the link between resistance, voltage and current in both: conductors and thermistors?
ReplyDeleteState the principle of moments?
ReplyDeletehi, are you able to do a blog for the science (physics) 5077 syllabus?
ReplyDeletethe principle of moments states that when an object is in equilibrium, the sum of clockwise moments about a pivot is equal to the sum of anticlockwise moments about the same pivot
ReplyDeleteSir I need 'deformation' chapter past paper questions.
ReplyDeletesir i need complete solution for numericals
ReplyDelete(structure questions) of olevels physics.kindly help me.tell me any site or about some notses.
What is non uniform deceleration?
ReplyDeleteWhat do you mean by the period of a simple pendulum? How would you investigate the effect of the length of a pendulum on it's period
ReplyDelete