MagnetismHard

Question

Two short bar magnets of length 1 cm each have magnetic moments 1.20 Am2 and 1.00 Am2respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the South. They have a common magnetic equator and are separatedby a distance of 20.0 cm. The value of the resultant horizontal magnetic induction at themid-point O of the line joining their centres is close to :-
(Horizontal component of earth′s magneticinduction is 3.6 × 10-5 Wb/m2)

Options

A.3.6 × 10-5 Wb/m2
B.2.56 × 10-4 Wb/m2
C.3.50 × 10-4 Wb/m2
D.5.80 × 10-4 Wb/m2

Solution

             
Bnet = B1 + B2 + Bearth 
+ 3.6 × 10-5 = 2.56 × 10-4 Web /m2

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