Question

(ii)Calculate the magnetic field produced by a bar magnet at a point 20 cm from the centre
of the magnet and making 60° with the axis . A bar magnet has magnetic moment 2Am?
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Answer 1

Answer

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Magnetic field due to a bar magnet of magnetic dipole moment M at a 

distance from it in a direction θ with its magnetic moment is 

B=4πμ0.r3M(3cos2θ+1)

where,

4πμ0=10−7Tm/A

Given,

            M=2Am2

              r=1m

              θ=600

⇒B=(10−7Tm/A)×(1m)32Am2×(43+1)

           =7×10−7T