Two short bar magnets of length 1 cm each have magnetic moments 1.20 Am2 and 1.00 Am2 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 resultand 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× 10.5Wb/m2 )

Question:

Two short bar magnets of length $1 \mathrm{~cm}$ each have magnetic moments $1.20 \mathrm{Am}^{2}$ and $1.00 \mathrm{Am}^{2}$ respectively. They are placed on a horizontal table parallel to each other with their $\mathrm{N}$ poles pointing towards the South. They have a common magnetic equator and are separated by a distance of $20.0 \mathrm{~cm}$. The value of the resultand horizontal magnetic induction at the mid-point $\mathrm{O}$ of the line joining their centres is close to (Horizontal component of earth.s magnetic induction is $3.6 \times 10.5 \mathrm{~Wb} / \mathrm{m}^{2}$ )

  1. $3.6 \times 10.5 \mathrm{~Wb} / \mathrm{m}^{2}$

  2. $2.56 \times 10.4 \mathrm{~Wb} / \mathrm{m}^{2}$

  3. $3.50 \times 10.4 \mathrm{~Wb} / \mathrm{m}^{2}$

  4. $5.80 \times 10.4 \mathrm{~Wb} / \mathrm{m}^{2}$


Correct Option: 2

JEE Main Previous Year 1 Question of JEE Main from Physics Magnetism and Matter chapter.
JEE Main Previous Year 2013

Solution:

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