# Calculating the field strength of an alternating magnetic field

1. Apr 2, 2012

### nanomic

I have a solenoid copper coil 7 cm lengths, 5 turns, r =0.75; applied current 145 V; 0.73 A; frequency 1.10 MHz and I'm still not able to calculate the magnetic field strength in kA/m. Can you help me?

I tried a number of formulas, but I just don't get it.
Please point me in the right direction.

Last edited: Apr 2, 2012
2. Apr 3, 2012

### NewtonianAlch

Well, what were the formulas you tried?

Also, did you pay attention to units? Note that the length is given in cm, and current in amps, but the units of the answer kA per metre.