Saba has 3 metal bars. To understand if they are magnets or not, she undertakes a small experiment and holds the ends of the bars close to one another. The results of this experiment are plotted below.
VWXYZ
BAR 1 BAR 2
BAR 3
Results:
End V (of Bar 1)
End W (of Bar 2)
Attracts
End V (of Bar 1)
End X (of Bar 2)
Repels
End V (of Bar 1)
End Y (of Bar 3)
Attracts
End V (of Bar 1)
End Z (of Bar 3)
Attracts
From the result above, conclude which bar(s) is/are magnetic? Give reason for your response. .............................
Answers
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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Explanation:
As per given observations , for Bar 1, we aren't given any results for the other end so we cant say with guarantee that it is a magnet
As per given observations, for Bar 2 both are able to perform attraction and repulsion respectively. So, Bar 2 is a magnet
As per given observations , for Bar 3, we see that both points seem to have the same poles, in magnet this is not possible. Hence it is not a magnet