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20 comments:

  1. can a unipolar magnet exist?(my techer said it practically doesn't exist!what does he mean???)

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    1. Hi Nagendra,

      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.

      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.

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  2. 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?

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    1. 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

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  3. 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.

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    1. u must state whether the battery is fixed voltage or not-then we can answer.

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  4. Sorry but is Force/Time graph in the syllabus?

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  5. Does acceleration really exist or is just a phenomenon?

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  6. It does exist

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  7. Explain why this way of placing glass slide is an inaccurate way of measurement. How can the value of width be improved significantly?

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  8. I have a got problem with convertions. plz help

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    1. give details-then can help u.

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  9. how to make free body diagram ?? plzz help me out

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  10. How to add vectors in two dimensions? I mean the vectors with components...

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  11. what is the position of electrons moving in a circuit??????

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    1. 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.

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    2. *comes again in the negative terminal of the battery after passing through the whole curcuit

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  12. What's the link between resistance, voltage and current in both: conductors and thermistors?

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  13. State the principle of moments?

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