At 15cm, you measure a magnetic field of about 1.5 mT. If the magnetic field of a permanent magnet is dipole-like in this region, what is th

Question

At 15cm, you measure a magnetic field of about 1.5 mT. If the magnetic field of a permanent magnet is dipole-like in this region, what is the closest magnetic field you would expect to measure at 30cm from the magnet?

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Thu Thủy 5 years 2021-08-31T16:25:28+00:00 1 Answers 33 views 0

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  1. Adela
    0
    2021-08-31T16:27:20+00:00
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    Answer:

    closest magnetic field is  0.2 MT

    Explanation:

    given data

    B = 1.5 mt

    r = 30 cm

    solution

    as here magnetic filed due to magnetic dipole is inversely is inversely proportion to distance cube  that is

    B ∝ \frac{1}{r^3}    …………….1  

    heer r1 is 15 cm and r2 is 30 cm

    so magnetic field is

    \frac{B2}{1.5} = (\frac{15}{30} )^3  

    solve we get

    B2 = 0.2 MT

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