Finding required coil current (magnetic circuit)

[youdontknowme0]

Homework Statement

Toroidal core
N = 1000 turns
R = 6cm
r = 1cm
established a total flux of 0.0002 Wb in a non-magnetic core.

Find the required coil current

 

[jaus tail]

From Flux and area you can find B as B = Flux / area.
From B you can refer to B-H curve and find H. The B-H curve would be of the non magnetic core material.
Your H = NI. You have your N. So the current can be found out.