How do similar (S-S or N-N) magnetic poles interact?
A. They repel each other.
B. They attract each other.
Ĉ. They become demagnetized.
D. They move closer together.

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?