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Equation (8.2) in the Lab 8 manual is a formula for the magnetic field strength

ID: 2099659 • Letter: E

Question

Equation (8.2) in the Lab 8 manual is a formula for the magnetic field strength at the center of the midplane between two "Helmholtz coils".  

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Assume that each coil consists of   N = 114 turns of wire and has a radius   a = 16 cm . Calculate the magnetic field strength that    I = 1.2  amp  of current will produce in the center of the midplane between the coils.  



I keep getting 7.7x10^-4 but it marks it as wrong

Explanation / Answer

B =uo*n*i/2*r