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Two short bar magnets of length 1 cm each have magnetic moments 1.20 Am 2 and 1.00 Am 2 respectively. 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 separated by a distance of 20.0 cm. The value of the resultant horizontal magnetic induction at the mid-point O of the line joining their centres is close to (Horizontal component of earth's magnetic induction is 3.6 × 10 –5 Wb/m 2 )

1. 3.50 × 10 –4 Wb/m 2
2. 5.80 × 10 –4 Wb/m 2
3. 3.6 × 10 –5 Wb/m 2
4. 2.56 × 10 –4 Wb/m 2

Correct answer: 2.56 × 10 –4 Wb/m 2

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