In 8 seconds, the magnetic flux of the penetrating loop will decrease from 9 to 3 mVB. Find the EMF of induction in the circuit.

To find out the required induction EMF in the presented circuit, consider the formula: εi = – (Ф – Ф0) / Δt, where Ф is the decreased magnetic flux (Ф = 3 mVb = 0.003 Wb); Ф0 – initial magnetic flux (Ф0 = 9 mVb = 0.009 Wb); Δt is the duration of the decrease in magnetic flux (Δt = 8 s).

Let’s calculate: εi = – (Ф – Ф0) / Δt = – (0.003 – 0.009) / 8 = 7.5 * 10-4 V.

Answer: The calculated EMF of induction in the presented circuit is 7.5 * 10-4 V.