How will u distinguish between a bar magnet,a brass rod & an iron rod of identical shape & colour?

Distinguish without any aid(not even a string)

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  • 1 decade ago
    Favorite Answer

    If you bundle all three rods together lengthwise as you might do with three sticks, two of the rods will tend to stick to each other. The one that does not show this tendency will be the the brass rod. Lay it aside.

    You then take one of the remaining rods and touch its end to the middle of the other remaining rod. The magnetic effect will be strong on the ends of the magnet but weak in the middle. Therefore, if you touch the end of the magnet to the middle of the nonmagnetized iron rod, the attraction will still be strong but the attraction will be weak if you touch the end of the nonmagnetized rod to the middle of the magnet. You can between strong and weak attraction if necessary by switching rods.

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  • 1 decade ago

    a bit long but effective,

    Let's call one rod A, one rod B, and the last rod C.

    Have them lined up on the floor in that sequence.

    First, touch the end of A to the middle of B.

    If it sticks, then A is the magnet, B is iron, and C is brass.

    If it does not stick, continue.

    Next, touch the end of A to the middle of C.

    If it sticks, then A is the magnet, C is iron, and B is brass.

    If it does not stick, continue.

    Next, touch the end of B to the middle of A.

    If it sticks, then B is the magnet, A is iron, and C is brass.

    If it does not stick, continue.

    Next, touch the end of B to the middle of C.

    If it sticks, then B is the magnet, C is iron, and A is brass.

    If it does not stick, continue.

    Next, touch the end of C to the middle of A.

    If it sticks, then C is the magnet, A is iron, and B is brass.

    If it does not stick, continue.

    Lastly, touch the end of C to the middle of B.

    If it sticks, then C is the magnet, B is iron, and A is brass.

    If it does not stick, something is wrong and you should

    try it all again.

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  • Anonymous
    1 decade ago

    The bar magnet will attract the iron rod, so I would select one rod and see if it pulls one of the other rods to it.

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  • Judith
    Lv 4
    4 years ago

    Funny! 100!

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  • 1 decade ago

    They heat at different rates ^^ :P

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