Question

Fluxes Produced by the Coils
If mutual inductance between two coil is zero when fluxes produced by them __________ ? a) Aid each other b) Oppose each other c) Are at right angles to each other d) None of the above.

Answer 1

c) Are at right angles to each other.

Answer 2

If mutual inductance between two coils is zero when fluxes produced by them c) Are at right angles to each other.

When is mutual inductance between two coils zero?

• Mutual inductance arises when there has been a flux coupling between any two coils (There are some wires, but not many.)
• Mutual inductance arises when the magnetic field generated by one coil is strong enough to influence another coil.
• Since the magnetic field intensity decreases dramatically with distance.
• As a result, coils that are far apart will have zero mutual inductance.
• Magnetic flux, like electric flux (current), likes to travel through certain materials (They have a lower permeability).
• If a coil is coated with a substance, the mutual inductance with other coils is very low, even at close distances.
• Another method this can occur is if a coil is coiled in such a manner that half of the coil receives flux in one way as well as the other side sees it in the opposite direction, in which case the impact of mutual inductance is neutralized and zero mutual inductance is attained.