Find the time δt it takes the magnetic field to drop to zero. express your answer in terms of some or all of the quantities a, b0, i, n, and r.

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)