Magnet Discs

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Help! A physics question! I don't even know where to begin :(

The idea that static magnetic fields might have a therapeutic vale has been around for centuries. A magnet disk is 3.0mm thick and has a field strength of 5.4 x10 ^-2 T at the center of the flat surface. The magnetic field strength points away from the center of the disk is inversely proportional to h^3, where h is the distance from the mid-plane of the disk. How far from the surface of the disk will the field strength be reduced to that of the Earth (5.0x10^-5 T)

The B field of the disk is

B(h) = (5.4 x10 ^-2 T ) h^3

At what value of h does this function have the value B(h) =5.0x10^-5 T ?

In other words find h when:

5.0x10^-5 = (5.4 x10 ^-2) h^3

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BrakeMagnetic DiscTorque 6 Ft Lb DAYTON 2LYU9
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Master Magnetics Ceramic Disc Magnets 10 Pc Set Model 07002
Master Magnetics Ceramic Disc Magnets 10 Pc Set Model 07002
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GUZIK S1701 DISC MAGNET MOTOR  Lot of 2
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Master Magnetics Neodymium Disc Magnets 3 pc Set 7047
Master Magnetics Neodymium Disc Magnets 3 pc Set 7047
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24inch Diamond 60Grit Diamond Flat Disc  None Holewith magnetic backing
24inch Diamond 60Grit Diamond Flat Disc None Holewith magnetic backing
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Dexter Magnetic Tech 2681MAGNETRONKOMAG10 5 1 2 Circular Magnetic Disc Chuck
Dexter Magnetic Tech 2681MAGNETRONKOMAG10 5 1 2 Circular Magnetic Disc Chuck
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40x Neodymium Magnet Disc d14x3 with Hole 176lbs N52 Workshop Keep Fit
40x Neodymium Magnet Disc d14x3 with Hole 176lbs N52 Workshop Keep Fit
$70.66
40x Neodymium Magnet Disc d14x3 with Countersink 176lbs N52 for screwing on
40x Neodymium Magnet Disc d14x3 with Countersink 176lbs N52 for screwing on
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40x Neodymium Magnet Disc d14x3 with Hole 176lbs N52 Powerful Mini
40x Neodymium Magnet Disc d14x3 with Hole 176lbs N52 Powerful Mini
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10x Neodymium Magnet Disc d14x3 with Countersink 176lbs N52  Wall Support
10x Neodymium Magnet Disc d14x3 with Countersink 176lbs N52 Wall Support
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20x Neodymium Magnet Disc d14x3 with Hole 176lbs N52 Magnetic Door Holder
20x Neodymium Magnet Disc d14x3 with Hole 176lbs N52 Magnetic Door Holder
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20x Neodymium Magnet Disc d14x3 with Hole 176lbs N52 Magnetic Wall Mounting
20x Neodymium Magnet Disc d14x3 with Hole 176lbs N52 Magnetic Wall Mounting
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10x Neodymium Magnet Disc d14x3 with Hole 176lbs N52 Magnetic Doorstop
10x Neodymium Magnet Disc d14x3 with Hole 176lbs N52 Magnetic Doorstop
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10x Neodymium Magnet Disc d14x3 176lbs N52 Holding with hole for screwing on
10x Neodymium Magnet Disc d14x3 176lbs N52 Holding with hole for screwing on
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10x Neodymium Magnet Disc d25x5mm 243lbs with Hole Magnets Neodymium Strong
10x Neodymium Magnet Disc d25x5mm 243lbs with Hole Magnets Neodymium Strong
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20x Neodymium Magnet Disc d25x5mm 243lbs with Hole N52 Strong Magnets Workshop
20x Neodymium Magnet Disc d25x5mm 243lbs with Hole N52 Strong Magnets Workshop
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6 New National Hardware Ceramic 5 Disc Magnet Fasteners 3 4 x 1 8 N302 240
6 New National Hardware Ceramic 5 Disc Magnet Fasteners 3 4 x 1 8 N302 240
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Neodymium Magnet Disc d40x10mm 1 9 16x0 3 8in 40x10 18739lbs N52 Strong
Neodymium Magnet Disc d40x10mm 1 9 16x0 3 8in 40x10 18739lbs N52 Strong
$23.95
MD Disc Struers 10 02426919 Magnetic Fixation Disc
MD Disc Struers 10 02426919 Magnetic Fixation Disc
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Neodymium Magnet Disc 1 31 32x0 31 32In 1 30865lbs Strong N52 lochmagnet
Neodymium Magnet Disc 1 31 32x0 31 32In 1 30865lbs Strong N52 lochmagnet
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Neodymium Magnet with Hole 3 15 16x0 25 32in 121254lbs Pull Strength N52 Disc
Neodymium Magnet with Hole 3 15 16x0 25 32in 121254lbs Pull Strength N52 Disc
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Neodymium Magnet Disc 1 9 16x0 31 32In 1 9 16in Diameter N52 20944lbs Handy
Neodymium Magnet Disc 1 9 16x0 31 32In 1 9 16in Diameter N52 20944lbs Handy
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Neodymium Magnet Disc 3 15 16x0 25 32in 121254lbs with Hole N52 Permanent
Neodymium Magnet Disc 3 15 16x0 25 32in 121254lbs with Hole N52 Permanent
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20x Neodymium Magnet d10x3mm with Hole 62lbs Disc Magnetic Wall Mounting
20x Neodymium Magnet d10x3mm with Hole 62lbs Disc Magnetic Wall Mounting
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500X Neodymium Magnet Disc d4x1mm N52 POSTCARD MAGNET MAGIC MAGNETS
500X Neodymium Magnet Disc d4x1mm N52 POSTCARD MAGNET MAGIC MAGNETS
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100 x Neodymium Magnet Disc D4X1 5 Magnetic Small Magnets Whiteboard Set
100 x Neodymium Magnet Disc D4X1 5 Magnetic Small Magnets Whiteboard Set
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20x Neodymium Magnet Disc d12x3mm Magnetic Small Magnets Experimental Magnet
20x Neodymium Magnet Disc d12x3mm Magnetic Small Magnets Experimental Magnet
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500X Neodymium Magnet Disc d4x1mm N52 Whiteboard Small GEOCACHING Crafts
500X Neodymium Magnet Disc d4x1mm N52 Whiteboard Small GEOCACHING Crafts
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40x Neodymium Magnet Disc d6x3mm Whiteboard Magnets Magnetic Magnets Crafts
40x Neodymium Magnet Disc d6x3mm Whiteboard Magnets Magnetic Magnets Crafts
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500X Neodymium Magnet Disc d4x1mm Magnetic POSTCARD MAGNET PIN Wall Magnet
500X Neodymium Magnet Disc d4x1mm Magnetic POSTCARD MAGNET PIN Wall Magnet
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Neodymium Magnet Disc d120x20 mm 16535 lbs with Hole Magnetic Wall Mount
Neodymium Magnet Disc d120x20 mm 16535 lbs with Hole Magnetic Wall Mount
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20x Neodymium Magnet Disc d12x3mm N35 Model Making Small GEOCACHING
20x Neodymium Magnet Disc d12x3mm N35 Model Making Small GEOCACHING
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200X Neodymium Magnet Disc d4x1mm N52 Small GEOCACHING Powerful Mini
200X Neodymium Magnet Disc d4x1mm N52 Small GEOCACHING Powerful Mini
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40x Neodymium Magnet d10x3mm with Hole 62 lbs Disc Workshop Keep Fit
40x Neodymium Magnet d10x3mm with Hole 62 lbs Disc Workshop Keep Fit
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40x Neodymium Magnet Disc d12x3mm N35 Whiteboard Small GEOCACHING
40x Neodymium Magnet Disc d12x3mm N35 Whiteboard Small GEOCACHING
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40x Neodymium Magnet Disc d6x3mm Postcard Magnet Magnet Set Magic Magnets
40x Neodymium Magnet Disc d6x3mm Postcard Magnet Magnet Set Magic Magnets
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200X Neodymium Magnet Disc d4x1mm Magnetic Small Experimen Animal
200X Neodymium Magnet Disc d4x1mm Magnetic Small Experimen Animal
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100 x Neodymium Magnet Disc D4X1 5 Whiteboard Magnets DIY Magnet Strong
100 x Neodymium Magnet Disc D4X1 5 Whiteboard Magnets DIY Magnet Strong
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50x Neodymium Magnet Disc D6 0 19 32x0 5 32in N35 Whiteboard DIY Strong
50x Neodymium Magnet Disc D6 0 19 32x0 5 32in N35 Whiteboard DIY Strong
$20.35

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