Figure 12 shows two circuits close to each other.

      

Figure 12 shows two circuits close to each other.
physics652017244.jpg
When the switch is closed, the galvanometer shows a reading and then returns to zero. When the switch is then opened, the galvanometer shows a reading in the opposite direction and then returns to zero. Explain these observations.

  

Answers


John
When the switch is closed, the magnetic field builds up to maximum is primary coil inducing a current in secondary coil. When the current is maximum there is no change in magnetic flux. When the switch is open, the magnetic field flux decreases to zero, carrying current to be induced in the secondary coil but in the opposite direction.
johnmulu answered the question on June 5, 2017 at 11:53


Next: What are the types of earthquake waves?
Previous: Figure 5 shows a magnet being moved towards a stationary solenoid. It is observed that a current flows through the circuit in a direction Q to P.

View More Physics Questions and Answers | Return to Questions Index


Exams With Marking Schemes

Related Questions