The magnetic field in a solenoid of length $L$ around an iron core with $N$ turns is given by: $$ B = \mu \frac{NI}{L}.$$. Assuming some Ohm's law type of resistance in the wire we can replace $I$ with $V/R$ to get $$ B = \mu \frac{NV}{LR}.$$. So the magnetic field strength increases linearly with both the number of turns and the voltage. The resistance of a wire is given by. $$ R = \rho \frac{l}{A}, $$.(where $\rho$ is some material property of the wire, $A$ is the cross sectional area and $l$ is the length) so that $LR = \rho Ll/A$ and.ssuming some Ohm's law type of resistance in the wire we can replace $I$ with $V/R$ to get $$ B = \mu \frac{NV}{LR}. $$. So the magnetic field strength increases linearly with both the number of turns and the voltage. The resistance of a wire is given by. $$ R = \rho \frac{l}{A}, $$.
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How Much Money Does a Registered Nurse Make Per Month? An RN's monthly pay will depend on many factors. In this article, we'll briefly touch on the differences in RN pay you can expect to receive. First, let's discuss how much registered nurses make in general. According to the Bureau of Labor Statistics, RNs make an average salary of $67,720 per year, and an average hourly wage of $32.56.