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Question

A short bar magnet placed at a certain distance from D.M.M in tan A position produces a deflection of 60o. The magnet is now cut into 3 equal pieces. If one piece is kept at same distance in tan A from D.M.M, then the deflection produced is


A
10o
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B
20o
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C
30o
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D
60o
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Solution

The correct option is A 30o
M1=PoleStrength×l
When the magnet is cut into 3 pieces, both mass and length become 13 rd of the previous ones, but pole strength does not change.
M2=PoleStrength×l3=M13
Given, θ1=60
tanθ2=M2M1tanθ1=13×tan60=13×3=13
θ2=30

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