Which one of the following statements concerning the magnetic field inside (far from the surface) a long, current-carrying solenoid is true?

Question

Quizplus · Accepted Answer

According to the Ampere's law the magnetic field inside a solenoid is nearly uniform and parallel to the solenoid axis. This means that the magnetic field is non-zero and nearly uniform inside the solenoid, and this field does not depend on the number of windings or the current in the solenoid. Therefore, option B is the correct answer. Option A is incorrect because the magnetic field is not zero, and option E is incorrect because the magnetic field does not vary as 1/r.

Which One of the Following Statements Concerning the Magnetic Field