Q. 195.0( 1 Vote )
The magnetometer
Answer :
Given,
separation between the magnet and the needle d = 10cm =0.1 m
deflection in the magnetometer in the given position when placed in the magnetic field of a short magnet, θ = 37°
let M be the magnetic moment of the magnet and BH be earth's horizontal magnetic field.
according to magnetometer theory
for short magnet → d ≫≫≫ l
deflection in the magnetometer θ =37°
From the magnetometer theory in Tan-B position, we have
-----------------------(1)
l≪≪≪d
d = 0.079370m =7.9370cm
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