Chapter 20, Problem 36P

& EST The magnitude of the $\stackrel{**\#x2192;}{B}$ field inside a long solenoid is given by the equation $B={\mu }_{0}I(N/l)$, where N is the number of turns and I is the length of the solenoid (a) Describe an experiment that can help you test this relation. (b) Explain whether this equation is an operational definition of the magnitude of the $\stackrel{\to }{B}$ field or a cause-effect relationship. (c) Powerful industrial solenoids produce $\stackrel{\to }{B}$ field magnitudes of about 30 T. Estimate the relevant physical quantities for such solenoids.