## Physics: Principles with Applications (7th Edition)

The magnetic field strength inside a solenoid is given by equation 20-8, $B=\frac{\mu_{o}NI}{L}$. a. No effect. The magnetic field strength doesn’t depend on the solenoid diameter. b. Magnetic field strength is halved. Doubling the spacing between the loops means doubling the length L of the solenoid. c. No net effect. Doubling both N and L has no effect.