Question

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Shown in the figure below is a long solenoid. Your solenoid has N loops, a length of L, and is carrying a current of I. We shall use the "long" approximation for which the field outside the solenoid is very very small compared to the field inside the solenoid. Use an Ampere path that extends the full length of the solenoid and closes outside the solenoid. N turns in the coil ത L A "Long' Solenoid (i.e. length >> diameter) What is the length of your Ampere path over which the field is not negligible? What is the current though this path? Use Ampere's Law to determine the FORMULA for the magnetic field inside the solenoid: What is the direction of the magnetic field inside the solenoid? O Toward the top of the screen O Out of the screen O Toward the right O Counter-clockwise as viewed from the left O Into the screen O Toward the left O Toward the bottom of the screen

Answer 1

Direction of B when the length of the amphere's path = Diameter of the solidroid Then the field is not negligible. current through the path = NI. Now From amphere's law 6 Bal = MONI of the 2 B.L 2 MONI RE MONI The direction of the magnetic field is towards the left. (as shown in field lines).