QNEET-2024-Ph-56: NEET 2024 Physics - Class 12 NEET-2024-Ph-56 Solution: In the above diagram a strong bar magnet is moving towards…

Core Concept & Governing Formula(s) - Faraday’s law: an emf is induced in a coil when the magnetic flux through it changes. - Lenz’s law: the induced emf (and thus the induced current) produces a magnetic field that opposes the change in flux. - Right‑hand rule for solenoids: if the current flows in the direction of the fingers, the thumb points to the north pole of the solenoid. Step 1: Identify the motion of the magnet relative to each solenoid. - The bar magnet moves from solenoid 1 toward solenoid 2. - The north pole of the magnet is the leading end; therefore the north pole is moving away from solenoid 1 and the south pole is approaching solenoid 2. Step 2: Determine the change of flux in solenoid 1. - As the north pole recedes, the magnetic field lines that entered solenoid 1 decrease. - The flux through solenoid 1 is decreasing in the direction of its original north‑pole field (from A to B). - By Lenz’s law, the induced magnetic field in solenoid 1 must try to **increase** the flux in the original direction, i.e., it must create a north pole at end B. Step 3: Infer the direction of induced current in solenoid 1. - To make end B a north pole, the current must flow from A to B (using the right‑hand rule). - Hence the induced current in solenoid 1 is **AB**. Step 4: Determine the change of flux in solenoid 2. - The south pole of the magnet approaches solenoid 2, so magnetic field lines entering solenoid 2 increase in the direction from C to D (south‑to‑north of the magnet). - The flux through solenoid 2 is increasing in the direction from C to D. Step 5: Infer the direction of induced current in solenoid 2. - Lenz’s law requires the induced field to oppose the increase, i.e., it must create a south pole at end C. - To make end C a south pole, the current must flow from D to C (right‑hand rule). - Hence the induced current in solenoid 2 is **DC**. Final Conclusion & Correct Option The induced current directions are AB in solenoid 1 and DC in solenoid 2. **Correct option: A) AB and DC**.