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 Welcome Winter Garden Flag by Toland #8295 $11.99 End Date: Thursday May-24-2012 0:29:45 PDT Buy It Now for only: $11.99 Buy It Now | Add to watch list |
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 Noro Silk Garden Scarf Kit - 4 skeins - #252 x 2, #349 x 1, #351 x 1 $49.99 End Date: Thursday May-24-2012 0:30:12 PDT Buy It Now for only: $49.99 Buy It Now | Add to watch list |
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 Winter Moose Garden Flag by Toland #8279 $11.99 End Date: Thursday May-24-2012 0:32:08 PDT Buy It Now for only: $11.99 Buy It Now | Add to watch list |
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Kahala Garden Men's Rayon Hawaiian Shirts 470-109 NEW Made in USA. Free Shipping $39.98 End Date: Thursday May-24-2012 0:32:54 PDT Buy It Now for only: $39.98 Buy It Now | Add to watch list |
Kahala Garden Men's Rayon Hawaiian Shirts 470-109 NEW Made in USA. Free Shipping $35.98 End Date: Thursday May-24-2012 0:32:54 PDT Buy It Now for only: $35.98 Buy It Now | Add to watch list |
Kahala Garden Men's Rayon Hawaiian Shirts 470-109 NEW Made in USA. Free Shipping $35.98 End Date: Thursday May-24-2012 0:32:54 PDT Buy It Now for only: $35.98 Buy It Now | Add to watch list |
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Kahala Garden Men's Rayon Hawaiian Shirts 470-109 NEW Made in USA. Free Shipping $35.98 End Date: Thursday May-24-2012 0:32:54 PDT Buy It Now for only: $35.98 Buy It Now | Add to watch list |
Kahala Garden Men's Rayon Hawaiian Shirts 470-109 NEW Made in USA. Free Shipping $35.98 End Date: Thursday May-24-2012 0:32:54 PDT Buy It Now for only: $35.98 Buy It Now | Add to watch list |
Kahala Garden Men's Rayon Hawaiian Shirts 470-109 NEW Made in USA. Free Shipping $37.98 End Date: Thursday May-24-2012 0:32:54 PDT Buy It Now for only: $37.98 Buy It Now | Add to watch list |
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Kahala Garden Men's Rayon Hawaiian Shirts 470-109 NEW Made in USA. Free Shipping $39.98 End Date: Thursday May-24-2012 0:32:54 PDT Buy It Now for only: $39.98 Buy It Now | Add to watch list |
 The Handy Garden Answer Book Karen Troshynski-Thomas $4.99 End Date: Thursday May-24-2012 0:33:14 PDT Buy It Now for only: $4.99 Buy It Now | Add to watch list |
 Wood Plant Flower Cart Garden 1:12 Dollhouse Miniature $6.99 End Date: Thursday May-24-2012 0:33:40 PDT Buy It Now for only: $6.99 Buy It Now | Add to watch list |
 Winter Bear Garden Flag by Toland #8278 $11.99 End Date: Thursday May-24-2012 0:34:10 PDT Buy It Now for only: $11.99 Buy It Now | Add to watch list |
 Fine Driftwood M size w caves, pet fish insect garden Aquarium Apisto Terrarium $4.90 End Date: Thursday May-24-2012 0:34:37 PDT Bid now | Add to watch list |
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![[1＋1] SW-19 FLOWER GARDEN Wall Decal Deco Mural Sticker](http://www.ayearinthegarden.com/media/1/images/e/3204838904734040_1.jpg) [1＋1] SW-19 FLOWER GARDEN Wall Decal Deco Mural Sticker $10.20 End Date: Thursday May-24-2012 0:34:48 PDT Buy It Now for only: $10.20 Buy It Now | Add to watch list |
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 SPRING GARDEN TABLETOP UNLIMITED SALAD PLATE $6.99 End Date: Thursday May-24-2012 0:39:01 PDT Buy It Now for only: $6.99 Buy It Now | Add to watch list |
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 Buckingham Palace Gardens: A Novel (Charlotte & Thomas Pitt Novels), Anne Perry, $1.00 End Date: Thursday May-24-2012 0:40:51 PDT Buy It Now for only: $1.00 Buy It Now | Add to watch list |
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 16 LEDs 800mAh Solar Motion Detection Sensor Light Waterproof Wall Garden Lamp $28.49 End Date: Thursday May-24-2012 0:44:00 PDT Buy It Now for only: $28.49 Buy It Now | Add to watch list |
 Lawn Garden Mechanical Water Timer Watering Hose Sprinkler Timer Auto Water Off $26.95 End Date: Thursday May-24-2012 0:44:00 PDT Buy It Now for only: $26.95 Buy It Now | Add to watch list |
 In My Mother's Garden by Vanessa-Ann and Ann Vanessa... $1.00 End Date: Thursday May-24-2012 0:44:24 PDT Buy It Now for only: $1.00 Buy It Now | Add to watch list |
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 Poppy Garden II Art Print by Lucia Marque, 16x20 $14.99 End Date: Thursday May-24-2012 0:46:13 PDT Buy It Now for only: $14.99 Buy It Now | Add to watch list |
A student claims that if lightning strikes a metal flagpole...?
A student claims that if lightning strikes a metal flagpole the force exerted by earth's magnetic field on the current in the pole can be large enough to bend it. Typical lightning currents are of the order of 10^4 to 10^5 A. Is the student's opinion justified?Explain your reasoning.
The magnitude of the force on the pole is I*L*B. The magnitude of the earth's field varies from 30 to 60 *10^-6 T. The force on the pole is then between 30*10^-6*10^4 to 60*10^-6*10^5 or 0.3 N/m to 6 N/m. Consider the best case (most deflection):
Lets say this is a steel pole of height 10 m and made of pipe that is 10 cm in diameter and 0.5 cm thick.
The end point deflection of a uniformly-loaded fixed-end beam (cantilever) is
δ = W*L³/(8*E*I)
W = total force
L = length
E = Young's modulus
I = area moment = π/64 * (Do^4 - Di^4)
W = 60 N (best case)
L = 10 m
E = 200*10^9 N/m²
I = 1.7*10^-6
δ = 60*1000/(8*2*10^11*1.7*10^-6) = 0.022 m
I guess he's right.