Concepts Of Physics MCQ Edition [Volume 2]PhysicsElectromagnetic Induction
Two circular loops having equal radii are positioned coaxially at a certain separation. The first loop is cut, and a battery is introduced to drive a current through it. Due to the variation of resistance with temperature, the current experiences a slight change. During this interval, the two loops
Options
- Arepel each other
- Battract each other
- Cattract or repel each other depending on the direction of the current
- Dexert no force on each other
Correct answer
B. attract each other
Step-by-step solution
When a battery is connected to the first loop, current flows through it, causing the wire to heat up due to the Joule heating effect. For metallic conductors, resistance increases with an increase in temperature. As the resistance of the first loop increases, the current flowing through it decreases. The decreasing current in the first loop leads to a decrease in the magnetic flux linked with the second coaxial loop. According to Lenz's law, an induced current is generated in the second loop in such a direction as