Lenz's Law — Prelims Questions
A bar magnet is moved rapidly towards a stationary circular coil. The North pole of the magnet approaches the coil. What is the direction of the induced current in the coil as viewed from the magnet side?
A rectangular conducting loop is pulled out of a uniform magnetic field directed into the page. As the loop is being pulled out, what is the direction of the induced current in the loop?
A long straight wire carries a current that is steadily increasing. A small circular loop is placed near the wire, such that the wire passes through the plane of the loop. What is the direction of the induced current in the loop?
A metal ring is dropped from a height and falls through a region with a uniform magnetic field. As the ring enters the magnetic field, what is the direction of the force acting on it due to the induced current?
A circular loop of wire is placed in a region where the magnetic field is uniform and directed out of the page. The loop is then compressed, reducing its area. What is the direction of the induced current in the loop?
A solenoid is connected to a battery, and a small conducting loop is placed near one end of the solenoid. If the current in the solenoid is suddenly switched off, what is the direction of the induced current in the loop?