Electromagnetic Induction Quiz

What is induced in the coil due to the magnetic field established by the current?

• A static charge

• An emf of the opposite polarity

• A thermal energy

• A light emission

What is the polarity of the emf induced by the magnetic field in the coil?

• Same as the original

• Opposite to the original

• Neutral

• Random

Which factor is NOT mentioned as affecting the induced emf?

• Length of the conductor

• Velocity of the conductor

• Temperature of the conductor

• Density of the magnetic field

Which of the following will increase the magnitude of the induced emf?

• Decreasing the length of the conductor

• Increasing the density of the magnetic field

• Reducing the velocity of the conductor

• Lowering the temperature

What is the unit of measurement for the rate of change of flux?

• Volts

• Amperes

• Webers per second

• Ohms

What does the 'L' represent in the formula used in the example?

• Voltage

• Current

• Inductance

• Resistance

What is mutual inductance measured in?

• Volts

• Amperes

• Henry's

• Ohms

What is the primary factor that affects the induced emf in the secondary coil?

• The length of the coil

• The rate of change of current

• The temperature of the coil

• The color of the coil

What is the formula used to calculate the mutual inductance in the example?

• M = (Number of turns × Rate of change of flux) / Rate of change of current

• M = (Rate of change of current × Rate of change of flux) / Number of turns

• M = (Number of turns × Rate of change of current) / Rate of change of flux

• M = (Rate of change of flux × Rate of change of current) / Number of turns

What happens to the induced emf if the rate of change of current is doubled?

• The induced emf is halved

• The induced emf is doubled

• The induced emf is quadrupled

• The induced emf remains the same