This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
ScanSolve AI Answer
Step 1: Determine the direction of the magnetic field. When the switch S is closed, current flows through the solenoid. Using the Right-Hand Grip Rule (or Right-Hand Solenoid Rule), if you curl the fingers of your right hand in the direction of the current flow (upwards on the front of the coils as shown by the arrows), your thumb will point to the right. This indicates that the right end of the solenoid becomes the magnetic north pole. Step 2: Identify the induced pole at end A. Since end A of the steel bar is at the right end of the solenoid, it will be induced with a north pole. Step 3: Consider the material properties. The core material is a "piece of steel". Steel is a hard magnetic material, meaning it is difficult to magnetize but retains its magnetism once magnetized. The process of closing and opening the switch several times repeatedly exposes the steel to the magnetic field, effectively magnetizing it. Step 4: Conclude the type of magnetism. Because steel is a hard magnetic material and it has been repeatedly magnetized, it will become a permanent magnet. Therefore, end A will become a permanent north pole. The correct option is B. B Send me the next one 📸