Physics help

[Alex40k]

Hello im working through my electromagnetism notes but one question has completely confused me, im wondering if anyone could give me a definitive answer or point me in the right direction?

A bar magnet has a magnetization, M, of 1200. What is the B and H field inside the magnet?

The magnet is then bent into a circle with a small gap between the ends, what is the H and B fields in this gap?

I have the equation B = mu0(H + M) and i know that the B field is continous across the boundary but i cant figure out whether H should be zero inside if not what is generating it?

Thanks a lot if you can help

Alex

 

[Alex40k]

Im afraid there isnt any more info, this is for Manchester uni, the 2001 electromagnetism paper. Im thinking that a loop integral is probably the right way of going about it i will persevere.