![]() ![]() ![]() The windings must be sufficiently closely-spaced that the magnetic field lines can only pass through the openings at the end of the coil and do not take any “shortcuts” between individual windings. Is applied as shown in Figures 7.6.2 and 7.6.3. Summing the results for many loops, we see that the direction of the magnetic field inside the coil must be generally in the When we consider this for a single turn of the coil, the situation is as shown in Figure 7.6.4. The wire comprising the coil is obviously not straight, but we can consider just one short segment of one turn and then sum the results for all such segments. This can be explained using the result for the magnetic field due to a straight line current (Section 7.5), in which we found that the magnetic field follows a “right-hand rule.” The magnetic field points in the direction of the fingers of the right hand when the thumb of the right hand is aligned in the direction of current flow. The magnetic field deep inside the coil is generally aligned with axis of the coil as shown in Figure 7.6.3. To begin, let’s take stock of what we already know about the answer, which is actually quite a bit. ![]()
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