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Two short bar magnets of length 1cm each have magnetic moments 1.20Am^2 and 1.00Am^2 respectively. They are placed on a horizontal table parallel to…

JEE Main 2013 — Physics Electromagnetism

2013mcqmedium

Two short bar magnets of length 1cm1cm1cm each have magnetic moments 1.20Am21.20A{m}^{2}1.20Am2 and 1.00Am21.00A{m}^{2}1.00Am2 respectively. They are placed on a horizontal table parallel to each other with their N\text{N}N poles pointing towards the south. They have a common magnetic equator and are separated by a distance of 20.0cm20.0\mathrm{cm}20.0cm. The value of the resultant horizontal magnetic induction at the mid-point O\text{O}O of the line joining their centres is close to

( Horizontal component of earth's magnetic induction is 3.6×10−5Wbm−23.6\times {10}^{-5}\mathrm{Wb}{m}^{-2}3.6×10−5Wbm−2 )

Official previous-year question

Held on 7 Apr 2013 · Verified 6 Jul 2026.

Options

  1. A

    3.50×10−4Wbm−23.50\times {10}^{-4}\mathrm{Wb}{m}^{-2}3.50×10−4Wbm−2

  2. B

    5.80×10−4Wbm−25.80\times {10}^{-4}\mathrm{Wb}{m}^{-2}5.80×10−4Wbm−2

  3. C

    3.6×10−5Wbm−23.6\times {10}^{-5}\mathrm{Wb}{m}^{-2}3.6×10−5Wbm−2

  4. D

    2.56×10−4Wbm−22.56\times {10}^{-4}\mathrm{Wb}{m}^{-2}2.56×10−4Wbm−2

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