web2.0calc
 
+0  
 

 help please

+1
2502
2
avatar+4622 

The strength of a bar magnet's magnetic field decreases with distance according to what is known as an inverse cube law; multiplying the distance from the magnet by a factor of k divides the magnetic field strength by a factor of \(k^3\)  .Suppose the magnetic field strength of the magnet is 64 Gauss at a distance of 10cm away. What is the magnetic field strength of the magnet, 20cm away?

 Jul 14, 2017

2+0 Answers

 #1
avatar
+2

Since the strength of the magnet decreases as the inverse cube of the distance, therefore:

64 x 1/(20/10)^3 =

64 x 1/2^3 =

64 x 1/8 =8 gauss - the strength of the magnet at 20 cm.

 Jul 14, 2017
edited by Guest  Jul 14, 2017
 #2
avatar
0

At  2 times the distance   it's  1/(2)^3    = 1/8 of the strength   which is   8

 

At 3 times the distance it would be 1/(3^3)

 

and at 4 times the distance it would be 1/(4^3)     and so on.

 Jul 14, 2017

0 Online Users

Top Users

avatar+129899 CPhill moderator
avatar+37153 ElectricPavlov
avatar+33661 Alan moderator
avatar+15000 asinus moderator
avatar+2511 GingerAle
avatar+2499 Solveit
avatar+1938 NotThatSmart
avatar+1557 parmen
avatar+1521 blackpanther
avatar+1455 kittykat
avatar+1310 learnmgcat

Sticky Topics