Induksi Faraday

A coil with 100 turns is placed in a magnetic field. If the magnetic flux through the coil changes from 0.02 Wb to 0.04 Wb in 0.1 seconds, what is the induced emf in the coil?

• 2 V

• 0.5 V

• 10 V

• 5 V

State Faraday's law of electromagnetic induction.

• Faraday's law of electromagnetic induction states that the induced emf in a circuit is directly proportional to the magnetic flux

• Faraday's law of electromagnetic induction states that the induced electromotive force (emf) in any closed circuit is equal to the rate of change of the magnetic flux through the circuit.

• Faraday's law of electromagnetic induction states that the induced emf in a circuit is inversely proportional to the rate of change of magnetic flux

• Faraday's law of electromagnetic induction states that the induced emf in a circuit is constant

What is the direction of the induced current in a coil when the magnetic flux through the coil is decreasing?

• The direction of the induced current in a coil when the magnetic flux through the coil is decreasing is such that it opposes the decrease in magnetic flux.

• The direction of the induced current is in the opposite direction of the coil

• The direction of the induced current is random and cannot be determined

• The direction of the induced current is in the same direction as the decrease in magnetic flux

If the magnetic flux through a coil changes at a rate of 0.02 Wb/s and the number of turns in the coil is 50, what is the induced emf in the coil?

• 0.5 V

• 0 V

• -1 V

• 2 V

Explain the concept of self-induction in a circuit.

• Self-induction creates a voltage that supports the change in current

• Self-induction occurs when the current in a circuit remains constant

• Self-induction only happens in circuits with high resistance

• Self-induction in a circuit occurs when a changing current in a circuit induces an electromotive force in the same circuit, creating a self-induced voltage that opposes the change in current.

What is the SI unit of magnetic flux?

• Weber (Wb)

• Newton (N)

• Joule (J)

• Tesla (T)

State Lenz's law of electromagnetic induction.

• Lenz's law states that the direction of the induced emf in a circuit is dependent on the resistance of the circuit.

• Lenz's law states that the direction of the induced emf in a circuit is random and unpredictable.

• Lenz's law states that the direction of the induced electromotive force (emf) in a circuit is such that it opposes the change in magnetic flux that produces it.

• Lenz's law states that the direction of the induced emf in a circuit is such that it supports the change in magnetic flux that produces it.

If the magnetic flux through a coil changes from 0.03 Wb to 0.01 Wb in 0.2 seconds, what is the induced emf in the coil?

• 200 V

• 100 V

• 25 V

• 50 V

Explain the factors affecting the magnitude of induced emf in a coil.

• The temperature of the coil

• The material of the coil

• The factors affecting the magnitude of induced emf in a coil include the number of turns in the coil, the strength of the magnetic field, the area of the coil, and the rate of change of the magnetic field.

• The color of the coil

What is the formula to calculate the induced emf in a coil?

• ε = -N(Φ/dt)

• ε = -N(dΦ/dt)

• ε = N(dΦ/dx)

• ε = N(dΦ/dt)