Magnetic Flux Linkage Concepts

The video tutorial covers key concepts in electromagnetism, starting with the definition of magnetic flux linkage. It explains how to calculate the number of turns in a coil and proves the expression for magnetic flux linkage. Faraday's law of electromagnetic induction is discussed, followed by a demonstration of sketching the graph of induced EMF over time. The tutorial concludes with an explanation of how EMF is induced in a transformer using an AC current and a soft iron core.

What is magnetic flux linkage?

• The product of magnetic flux and the number of turns in a coil

• The difference between magnetic flux and the number of turns in a coil

• The sum of magnetic flux and the number of turns in a coil

• The ratio of magnetic flux to the number of turns in a coil

Which formula can be used to define magnetic flux linkage alternatively?

• B * A * cot(theta)

• B * A * sin(theta)

• B * A * cos(theta)

• B * A * tan(theta)

How can the number of turns in a coil be calculated?

• By dividing the length of the wire by the diameter of the coil

• By dividing the length of the wire by the circumference of the coil

• By multiplying the length of the wire by the radius of the coil

• By adding the length of the wire to the circumference of the coil

What is the formula for the number of turns in a coil with length L and radius R?

• L + 2 * pi * R

• 2 * pi * R / L

• L / (2 * pi * R)

• L * 2 * pi * R

What is the expression for magnetic flux linkage in a coil?

• L * B * R / 2

• L * B * R * 2

• L / (B * R * 2)

• L * B / (R * 2)

According to Faraday's Law, what is the induced emf proportional to?

• The rate of change of resistance

• The rate of change of magnetic flux linkage

• The rate of change of voltage

• The rate of change of electric current

What is the relationship between emf and magnetic flux linkage?

• Emf is equal to the square of the rate of change of magnetic flux linkage

• Emf is equal to the cube of the rate of change of magnetic flux linkage

• Emf is equal to the negative rate of change of magnetic flux linkage

• Emf is equal to the positive rate of change of magnetic flux linkage

What role does the soft iron core play in a transformer?

• It increases the current in the primary coil

• It increases the resistance of the coil

• It links the magnetic flux between the primary and secondary coils

• It decreases the voltage in the secondary coil

How is an electromotive force induced in the secondary coil of a transformer?

• By a decreasing magnetic flux linkage

• By an increasing magnetic flux linkage

• By a changing magnetic flux linkage

• By a constant magnetic flux linkage

What causes the changing magnetic flux linkage in a transformer?

• Alternating current in the primary coil

• Direct current in the primary coil

• Constant voltage in the primary coil

• Constant current in the primary coil