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Question: What is the magnitude of axial field due to a bar magnet of length 3 cm at a distance of 75 cm from ...

What is the magnitude of axial field due to a bar magnet of length 3 cm at a distance of 75 cm from its mid-point if its magnetic moment is 0.6 A m2 ?

A

0.013μT0.013 \mu \mathrm { T }

B

0.113μT0.113 \mu \mathrm { T }

C

0.213μ T0.213 \mu \mathrm {~T}

D

0.313μT0.313 \mu \mathrm { T }

Answer

0.213μ T0.213 \mu \mathrm {~T}

Explanation

Solution

: Here,

m=0.6Am2,r=75 cm=0.75 m\mathrm { m } = 0.6 \mathrm { Am } ^ { 2 } , \mathrm { r } = 75 \mathrm {~cm} = 0.75 \mathrm {~m}