99 Percentile Qs Bank for JEE MainPhysicsMagnetic Properties of Matter
Two small bar magnets of length 1 cm each have magnetic moments 1.20   A  m 2 and 1 .00   A   m 2 respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the south. They also have the same magnetic equator and separation between them is 20 .0   cm . What will be the value of the resultant horizontal magnetic induction at the mid-point O o
Options
- A3 .50 × 10 - 4   Wb   m - 2
- B5.80 × 10 - 4   Wb   m - 2
- C3.6 × 10 - 5   Wb   m - 2
- D2 .56 × 10 - 4   Wb   m - 2
Correct answer
D. 2 .56 × 10 - 4   Wb   m - 2
Step-by-step solution
B net = B 1 + B 2 + B H = μ 0 4 π M 1 x 3 + μ 0 4 π M 2 x 3 + B H = 10 − 7 ( 1.2 + 1 ) ( 0.1 ) 3 + 3.6 × 10 − 5 = 2 .56 × 10 - 4   Wb   m - 2