Question

Определите эдс самоиндукции возникающую в катушке индуктивностью 12 гн если сила тока в ней за 2с уменьшилась от 8 до 0А?

Answer 1

Формула ЭДС самоиндукции
$E=-L \frac{I}{t}   E=-12* \frac{8}{2} =48$

Answer 2

Calculating Self-Inductance in a Coil

To calculate the self-inductance (L) in a coil when the current decreases from 8A to 0A in 2 seconds, we can use the formula:

L = (ΔΦ) / (ΔI / Δt)

Where: - L = self-inductance in henrys (H) - ΔΦ = change in magnetic flux - ΔI = change in current - Δt = change in time

Given: - Initial current (I1) = 8A - Final current (I2) = 0A - Change in current (ΔI) = I2 - I1 = 0A - 8A = -8A - Change in time (Δt) = 2s

We need to find the change in magnetic flux (ΔΦ).

Finding Change in Magnetic Flux

The change in magnetic flux can be calculated using the formula:

ΔΦ = L * ΔI / Δt

Substitute the given values: - ΔI = -8A - Δt = 2s

ΔΦ = L * (-8A) / 2s

Now, we can solve for ΔΦ.

Calculating Self-Inductance

Using the calculated value of ΔΦ, we can find the self-inductance (L) using the formula:

L = ΔΦ / (ΔI / Δt)

Substitute the calculated value of ΔΦ and the given values of ΔI and Δt to find L.

After calculating the value of L, we can determine the self-inductance in the coil.