- #1
creativepinky
- 3
- 0
Homework Statement
This is a two part question I just want to check I'm on the right track - it just seems too easy to be worth the marks they're given so apologies now if I'm stating the obvious:
a) Write down an equation for the magnitude B of the magnetic field at a distance D away in a vacuum from an infinitely long wire carrying a current i.
b) Find the magnitude and direction of the magnetic field at the point O located at a distance D=10cm form a wire carrying a current i = 1.0A directed into the page.
The Attempt at a Solution
For a) I've got B(D)= (μ_0 i)/2πD
Where μ_0 is the permeability of free space constant at 4π x 10^-7 T m A-1
for b) I've just put the figures into the above equation, giving:
B(D) = (4 x 3.14 x 10^-7) x 1A / (2 x 3.14) x 0.1m
That just seems far too easy - what am I missing? Many thanks