One conducting U-tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed , then the emf induced in the circuit in terms of and where is the width of each tube will be:
- A
- B
- C
- D
Solution & Step-by-step Explanation
When the tubes move towards each other with speed , the relative velocity with which the area of the circuit decreases is .Induced EMF .
Alternatively, each side of the moving "loop" produces an EMF of . Since they are moving towards each other, these EMFs add up in the same sense around the loop.
Alternatively, each side of the moving "loop" produces an EMF of . Since they are moving towards each other, these EMFs add up in the same sense around the loop.