A solenoid has a 3cm x 3cm square cross section, 1800 turns,alength of a 75cm and carries a 12A current.

What is the maximum torque on this solenoid if it sites inauniform magnetic field of 5 mT?

I found the magnetic field inside this solenoid to be.0362mT.

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Nestor RutherfordLv2

15 May 2019

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Magnetic Field inside a Very Long Solenoid Learning Goal: To apply Ampère's law to find the magnetic field inside an infinite solenoid. In this problem we will apply Ampère's law. To calculate the magnetic field inside a very long solenoid (only a relatively short segment of the solenoid is shown in the pictures). The segment of the solenoid shown in (Figure 1) has length L, diameter D, and n turns per unit length with each carrying current I. It is usual to assume that the component of the current along the z-axis is negligible. (This may be assured by winding two layers of closely spaced wires that spiral in opposite directions.) From symmetry considerations, it is possible to show that far from the ends of the solenoid, the magnetic field is axial.

A) What is Iencl, the current passing through the chosen loop?

B) Find Bin, the z component of the magnetic field inside the solenoid where Ampère's law applies.

apricotgrasshopper940

Problem Details

Magnetic Field inside a Very Long Solenoid Learning Goal: To apply Ampère's law to find the magnetic field inside an infinite solenoid. In this problem we will apply Ampère's law to calculate the magnetic field inside a very long solenoid (only a relatively short segment of the solenoid is shown in the pictures). The segment of the solenoid shown in (Figure 1) has length L, diameter D, and n turns per unit length with each carrying current I. It is usual to assume that the component of the current along the z axis is negligible. (This may be assured by winding two layers of closely spaced wires that spiral in opposite directions.) From symmetry considerations, it is possible to show that far from the ends of the solenoid, the magnetic field is axial.

Part D

What is Iencl, the current passing through the chosen loop?

Express your answer in terms of L (the length of the Ampèrean loop along the axis of the solenoid) and other variables given in the introduction.

Part E

Find Bin, the z component of the magnetic field inside the solenoid where Ampère's law applies.

Express your answer in terms of L, D, n, I, and physical constants such as ?

orchidlocust372

Learning Goal:

To apply Ampère's law to find the magnetic field inside an infinite solenoid.

In this problem we will apply Ampère's law, written

to calculate the magnetic field inside a very long solenoid (only a relatively short segment of the solenoid is shown in the pictures). The segment of the solenoid shown in (Figure 1) has length L, diameter D, and n turns per unit length with each carrying current I. It is usual to assume that the component of the current along the z-axis is negligible. (This may be assured by winding two layers of closely spaced wires that spiral in opposite directions.)

From symmetry considerations, it is possible to show that far from the ends of the solenoid, the magnetic field is axial.

a) What is Iencl, the current passing through the chosen loop? Express your answer in terms of L (the length of the Amperean loop along the axis of the solenoid) and other variables given in the introduction.

b) Find Bin, the z component of the magnetic field inside the solenoid where Ampere's law applies. Express your answer in terms of L, D, n, I, and physical constants such as μ0.