What determines the sign of mutual inductance (M) when analyzing coupled coils?

The relative polarities of the induced EMFs from self and mutual inductance.

If both currents enter the dotted ends of the coupled coils, what can be said about the mutual inductance (M)? A) It is positive B) It is negative C) It is zero D) It is undefined

A) It is positive

True or False: The coupling coefficient (k) can have a value greater than 1.

False. The coupling coefficient (k) ranges from 0 (no coupling) to 1 (perfect coupling).

Fill in the blank: The dot convention helps to determine the ______ at the dotted terminal of a coil.

Polarity of induced voltages

Riddle: I link two coils without physical contact, my value can be zero or one, optimizing energy transfer in a circuit. What am I?

Coupling coefficient (k)

In a transformer, if the primary current enters at the dotted terminal, how does this affect the secondary voltage's polarity?

The induced voltage in the secondary will be positive at its dotted terminal.

Which of the following describes electrical coupling? A) No physical connection B) Physical connection between coils C) Only mutual inductance D) Only self-inductance

B) Physical connection between coils

Fill in the blank: The equivalent inductance for aiding coupling in series is given by LEq = L1 + L2 + ______.

2M

True or False: Magnetic coupling occurs when two coils have a physical connection.

False. Magnetic coupling occurs without a physical connection between coils.

What is the effect of a ferromagnetic core on mutual inductance (M) in transformers?

It concentrates the magnetic flux and increases mutual inductance, ensuring efficient energy transfer.