Two coils are placed close together in a physics lab to demonstrate Faraday's law of induction. A current of 8.00 A in one is switched off in 1.20 ms, inducing a 3.00 V emf in the other. What is their mutual inductance (in mH)

M = 0.45 mH

Explanation:

For the system described in the statement, you have that the induced emf of both coils are given by:

          (1)

ε1, ε2: induced emfs

M: mutual inductance

I1, I2: current on the wires

That is, the induced emf of one coil is generated by the change in the current of the other coil.

You can consider that the current of 8.0A belongs to the second coil, and the induced emf of 3.00V is generated in the first coil. The current of the second coil is switched off in 1.20ms.

With the previous information you have:

ε1 = 3.00V

ΔI2 = 0.00A - 8.00A = -8.00A

Δt = 1.20ms = 1.2*10^-3 s

You use the equation (1) to solve for M:

The mutual inductance of the coils is 0.45mH

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force