Question 58 Bb/Ba? What is the ratio mu a/ mu b of the dipole moment magnitudes

Question

Question 58

Bb/Ba? What is the ratio mu a/ mu b of the dipole moment magnitudes of the coils? What is the magnitude of the magnetic dipole moment fl of the solenoid described in Problem 49? Figure 29-73 shows an arrangement known as a Helmholtz coil. It consists of two circular coaxial coils, each of 200 turns and radius K = 25.0 cm. separated by a distance s = R. The two coils carry equal currents i = 12.2 mA in the same direction. Find the magnitude of the net magnetic field at P, mid-way between the coils.

Explanation / Answer

B=(4/5)3/2 [(0 n i)/R)] to find the magnetic field in the center of helmholtz coils. To derive the formula all you have to do is say the total current is n I, and we know that x= R/2) and perform the substitution and multiply the whole thing by 2 for the two coils.

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