Question

Question 24
Saba has 3 metal bars. To understand if they are magnets or not, she undertakes a small experiment an
holds the ends of the bars close to one another. The results of this experiment are plotted below.
BAR
BAR 2
BAR 3
End V (of Bar 1)
End V (of Bar 1)
End V (of Bar 1)
End V (of Bar 1)
End W (of Bar 2)
End X (of Bar 2)
End Y (of Bar 3)
End Z (of Bar 3)
Attracts
Repels
Attracts
| Attracts
From the result above, conclude which bar(s) is/are magnetic? Give reason for your response.​

Answer 1

MAGNETISM

It is given to us that there are 3 bars :-

• Bar 1 ; Bar 2 ; Bar 3

Result of Experiment given :-

• VWXYZ

These letters show the end points of the 3 bars.

• V - End Point of Bar 1
• WX - End Points of Bar 2
• YZ - End Points of Bar 3

Result in terms of attraction/repulsion is as under :-

• V(Bar 1) attracts W(Bar 2)
• V(Bar 1) repels X(Bar 2)
• V(Bar 1) attracts Y(Bar 3)
• V(Bar 1) attracts Z(Bar 3)

By the above result we can have two scenarios :-

(1) V = North

    W = South

    X = North

    Y = South

    Z = South

(2) V = South

    W = North

    X = South

    Y = North

    Z = North

Observe the above scenarios carefully :-

Can we have two same poles in a single bar magnet?

The answer is NO.

We can see that, YZ points both have same poles - either N-N or S-S which is not possible in a bar magnet. So, Bar 3 isn't a magnet.

Now, coming to other two Bars.

We can see, that both the ends of Bar 2 are able to perform attraction and repulsion respectively. They have either N-S poles or S-N poles. So, Bar 2 is a magnet.

In the case of Bar 1, we aren't given any results for the other end point so we cannot say with a guarantee that the other end point of Bar 1 will work in an opposite way to V. So, we cannot say whether Bar 1 is a magnet or not.

Therefore, BAR 2 is the only magnet in the above question.

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Answer 2

The bar 2 is magnet.

Explanation:

The image given in the question is attached below.

• A magnet has north pole and south pole. The poles of same orientation repel and poles of different orientation attract each other.
• The bar 3 attracts for both the sides whereas the bar 2 attracts and repels each other. The bar 1 has given only one end.
• Since, the bar 2 has both north pole and south pole. Thus, bar 2 is a magnet whereas bar 1 & 3 is not a magnet.