(b) decreases gradually
© increases instantly then vanishes
decreases instantly then vanishes
coil, so when the circuit of the primary coil is opened, the generated current in the circuit
of the secondary coil will be…
(a) Forward induced instantaneous current
(b) Back induced instantaneous current
© Altermating current
(d) Direct current

When the primary coil’s circuit is opened, the magnetic field collapses, inducing a current in the secondary coil. This phenomenon can be imagined like a dramatic magic trick: just when you think the show is over, the magician pulls a rabbit out of the hat! In this case, the induced current tends to flow in the opposite direction, leading to a temporary back induced instantaneous current.

In practical applications, this behavior can be observed in transformers and inductive kickback in relay circuits. Knowing this helps in designing circuits properly; for instance, engineers often include diodes to manage this back induced current and protect sensitive components from damage. So, it’s all about turning that magical moment into a safe and efficient electrical experience!