Answers

2015-10-14T21:35:29+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
The value of magnetic field given is not clear... 10-8 ??  is that  10^{-8}

The magnetic field B of induction at a point P at distance d from the long wire is given by :  B =  Mu_0  i / (2 π d)

   It is inversely proportional to the distance.

   So the field at 12 cm will be = 1/3 of field at 4 cm.. which is 10^{-9} Tesla.
 
  So   (A)  3.33 * 10^{-8} Tesla


1 5 1